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Author name code: mattig
ADS astronomy entries on 2022-09-14
author:"Mattig, Wolfgang"
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Title: Book Review: Kommandosache Sonnengott. Geschichte der deutschen
Sonnenforschung im Dritten Reich und unter alliierter Besatzung
(Seiler)
Authors: Mattig, Wolfgang; Schmidt, Wolfgang; Seiler, Michael P.
2007JAHH...10...73M Altcode:
No abstract at ADS
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Title: Mercury Transit for Stray Light Evaluation: IPM-THEMIS Case
Authors: Briand, C.; Mattig, W.; Ceppatelli, G.; Mainella, G.
2006SoPh..234..187B Altcode:
Mercury's transit on the solar disk offers ideal conditions to determine
the stray light level of instruments. We present here the results on the
stray light level deduced from the observation of the Mercury transit
on 2003 May 7th at the secondary focus of the THEMIS telescope with the
broad-band and spectral channels of the IPM instrument. The scattered
light in the broad-band channel is about 17% and about 25% in the
spectral channel. The spread function was deduced for the two channels
taking into account the observations on the limb and on Mercury's disk.
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Title: The first decades of JOSO - the Joint Organization for Solar
Observations
Authors: Brandt, Peter N.; Mattig, Wolfgang
2005dsr..conf..240B Altcode:
No abstract at ADS
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Title: The first decades of JOSO -- the Joint Organization for
Solar Observations
Authors: Brandt, Peter N.; Mattig, Wolfgang
2005AcHA...25..240B Altcode:
In 1969 a group of leading European solar physicists established
the Joint Organization for Solar Observations (JOSO) with the aim to
promote international cooperation and to find an outstanding site for a
new European solar observatory. After an extensive site test finally in
1979 they found excellent sites on the Canary Islands for the deployment
of several national instruments in the framework of the newly founded
Instituto de Astrofísica de Canarias. The well co-ordinated thriving
international cooperation made the continuation of JOSO desirable
even after the fulfilment of the originally planned goals. New fields
of cooperation were found, in particular the ground-based support of
the SOHO mission. After the fall of the “iron curtain” in 1989
intensive collaboration with the Eastern-European institutes was
initiated, and JOSO turned into an enterprise for broad scientific
and technological exchange.
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Title: JOSO - the Protagonist for a closer cooperation in Europe -
some historical remarks
Authors: Mattig, W.
2004HvaOB..28....1M Altcode:
After two meetings about solar seeing in Rome (1961, 1962), 1969
Solar Physicists from seven European countries founded an organization
named JOSO to build an European Solar Observatory. Besides this the
"Joint Organization for Solar Observation" supported every cooperation
between the different institutes. In Bern 1974 a combined meeting
between optical and radio colleagues took place and one year later it
was proposed to create a Solar Physics Section as part of the European
Physical Society. This was approved 1976, but the important meeting
1975 in Firenze was numbered as the First European Solar Meeting. To
build an European Large Solar Telescope the LEST-foundation was founded
1983 in Stockholm, unfortunately it was dissolved in 2002. In the last
ten years many countries from eastern Europe became members of JOSO,
now colleagues from 27 countries are members of this joint organization.
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Title: Obituary: Anton Bruzek (1915-2003)
Authors: Mattig, Wolfgang
2003SoPh..216....1M Altcode: 2003SoPh..216....1.
No abstract at ADS
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Title: The History of the Joint Organization for Solar Observations
(JOSO) 1969-2000
Authors: Brandt, P. N.; Mattig, W.
2003ANS...324...94B Altcode: 2003ANS...324..K09B
No abstract at ADS
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Title: Merkur vor der Sonne. Eine Fisternis der besonderen Art
Authors: Mattig, Wolfgang; Soltau, Dirk
2003S&W....42d..66M Altcode:
No abstract at ADS
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Title: The history of the Joint Organization for Solar Observation
(JOSO) 1969 - 2000
Authors: Brandt, Peter N.; Mattig, Wolfgang
2002ASSL..280..135B Altcode: 2002osa3.book..135B
In 1969 a group of leading European solar physicists established the
Joint Organization for Solar Observations (JOSO) aiming at promoting
international cooperation and at finding an outstanding site for a new
European solar observatory. After extensive site testing, excellent
locations were found in 1979 on the Canary Islands for the deployment
of several national instruments in the framework of the newly founded
Instituto de Astrofísica de Canarias. The well co-ordinated thriving
international cooperation made the continuation of JOSO desirable even
after the fulfilment of the originally planned goals. New fields of
cooperation were found, in particular the ground-based support for
the SOHO mission. After the opening of the "iron curtain" in 1989,
intensive collaboration with the Eastern European institutes was
initated and JOSO turned into an enterprise for broad scientific and
technological exchange.
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Title: H. Haupt and JOSO
Authors: Mattig, W.
2001HvaOB..25....1M Altcode:
No abstract at ADS
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Title: Convective overshooting on the Sun: radiative effects
Authors: Kiefer, M.; Grabowski, U.; Mattig, W.; Stix, M.
2000A&A...355..381K Altcode:
We calculate solar models with convective overshooting at the top
and at the base of the outer convection zone, and test the models
by comparing their eigenfrequencies to the observed solar p-mode
frequencies. Radiative temperature relaxation is included in form of a
characteristic time that describes both optically thick and thin cases,
and a modified mixing-length formalism is used, with gas parcels
traveling varying path lengths. These modifications to the common
mixing-length theory generally change the efficiency of the convective
energy transport, and therefore the stratification at and immediately
below the surface of the Sun. Radiative relaxation lowers the
convective efficiency and so leads to a steeper temperature gradient,
with the consequence that the temperature becomes somewhat larger in the
near-surface layer, but slightly lower in the upper convection zone; due
to the latter effect there is a negative correction to eigenfrequencies
above ~ 2 mHz. The effect of convective parcels with varying path
lengths is opposite. In the solar interior, radiative relaxation is in
the diffusion limit and therefore has no immediate effect at the base of
the convection zone. However, the larger mixing-length to scale-height
ratio caused by the near-surface effect leads to farther overshooting
at the base. The effect of the multiple-path models is in the same
direction. For most of our models the extent of the overshooting is
larger than permitted by the helioseismic constraint of ~ 0.1 pressure
scale heights, but for some models it is marginal. At the surface the
efficient optically thin radiative relaxation smoothes the temperature
gradient. Both the radiation and the multiple-path effects lead to
more extended overshooting. The models reach ~ 200 km of overshooting,
with temperature fluctuations of up to several hundred Kelvin. We
compare the results with spectroscopic investigations, and with recent
three-dimensional hydrodynamic numerical simulations. A general result
is that mixing-length theory appears unable to reproduce in detail
the properties of solar convection that are directly observed at the
surface or inferred by helioseismology. The improvements based on even
sophisticated modifications remain limited.
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Title: Walter Grotrians fundamentale Beiträge zur Physik der
Sonnenkorona.
Authors: Mattig, W.
1999S&W....38..557M Altcode:
No abstract at ADS
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Title: Geschichte der Sonnenforschung.
Authors: Mattig, W.
1999S&WSp...4...86M Altcode:
No abstract at ADS
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Title: Sonnenfinsternisse und die Lichtablenkung.
Authors: Mattig, W.
1998S&W....37.1045M Altcode:
No abstract at ADS
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Title: Velocity and intensity oscillations in sunspot penumbrae.
Authors: Sigwarth, M.; Mattig, W.
1997A&A...324..743S Altcode:
Velocity and intensity oscillations in the penumbra of a sunspot close
to disc center are investigated at various atmospheric heights from the
photosphere to the upper chromosphere using simultaneous time series
of spectra of FeI 5123Å, Mg b1, Na D1/D2, NiI 5893Å, Hα and CaII
8542Å. Line core shifts and intensity variations are determined for
all positions along the slit and power, coherence and phase spectra
are calculated. Both Doppler velocities and line core intensity
fluctuations are significantly reduced inside the penumbra and the
surrounding plage region in all atmospheric layers compared to the
surrounding quiet sun. Inside the penumbra the velocity oscillations
are found to be coherent over a larger spatial range in photospheric
and middle chromospheric layers than outside. Velocity power spectra
show the 5-minute oscillations up to lower chromospheric levels from
the inner to outer penumbra boundary. Only in the layer below the
temperature minimum the 5-minute oscillations are not detectable in
the inner and central penumbra. In the upper chromosphere frequencies
significantly changes from 6mHz at the inner penumbra to around 1.5mHz
at the outer penumbra boundary. Intensity oscillations show power at
low frequencies (<=2mHz) outside the spot and in the outer penumbra
in all atmospheric layers while in the central penumbra power in
the 5-minute range is present only in the layer below the temperature
minimum. From a coherence and phase analysis we find upward propagating
waves inside the penumbra with a different behavior in deeper and higher
layers and compared to the quiet sun. No differences could be found
for the oscillatory behavior in dark and bright penumbral filaments
(at a mean spatial resolution of 1arcsec).
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Title: Hans-Heinrich Voigt und die Göttinger Sonnenphysik.
Authors: Mattig, W.
1996S&W....35..818M Altcode:
No abstract at ADS
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Title: Temperature and velocity fluctuations in the deeper layers
of the solar atmosphere.
Authors: Vollmoeller, P.; Komm, R.; Mattig, W.
1996A&A...306..294V Altcode:
To study temperature and velocity fluctuations in the lower photosphere
of the Sun, we analyzed spectrograms obtained with the Vacuum Tower
Telescope of the Observatorio del Teide in Tenerife in a spectral
range at about 410nm, the secondary minimum of the continuum absorption
coefficient. We find much larger temperature fluctuations than deduced
by previous investigations at almost all photospheric heights. The
velocity fluctuations show the same height dependence as deduced by
earlier studies at mid- and upper photospheric layers (at heights
larger than about 100km above τ_0_=1), but they do not increase as
rapidly with decreasing height in the lower photosphere. The results
indicate the existence of a velocity maximum located at the bottom
of the photosphere or slightly below in subphotospheric layers. The
location of this maximum agrees reasonably well with predictions of
convection zone models.
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Title: Die Sonne
Authors: Mattig, W.
1996AN....317...18M Altcode:
No abstract at ADS
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Title: Book Review: Die Sonne, C.H. Beck Verlag, 1995, 125p.,
ISBN 978-3-406-39001-2
Authors: Posch, Thomas; Mattig, Wolfgang
1995Stern..71..306P Altcode:
No abstract at ADS
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Title: Oscillations above sunspot umbrae.
Authors: Kentischer, T. J.; Mattig, W.
1995A&A...300..539K Altcode:
Long time series of two dimensional filtergrams of the chromosphere
above a sunspot in the line cores of Hα (λ656.2nm), CaIIK (λ393.3nm)
and in MgIb (λ517.3nm) were recorded simultaneously. The following
conclusions can be drawn: The Power spectra of Hα and CaIIK show
two distinct distributions between 5 and 9mHz. The first peak at
5.9mHz is relatively narrow (FWHM=1.2mHz) and consists mainly of
upward propagating waves travelling with sound speed (7km/s). There
are indications that the oscillations found in this frequency domain
have their origin in the underlaying layers. Therefore this first
distribution may be a fingerprint of the photospheric resonator. A
phase analysis of the horizontal propagations of the oscillations
yields a typical inclination of the magnetic field lines in the umbral
chromosphere of 5deg. A second distribution at 7.5mHz has a width of
3.3mHz. The involved oscillations have characteristics of standing
waves. There is no correlation between the oscillations found in the
chromosphere and these, located near the temperature minimum layers,
so they are confined to the chromosphere itself.
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Title: Von der Rotverschiebung zum solaren Magnetfeld.
Authors: Mattig, W.
1995Stern..71..127M Altcode:
No abstract at ADS
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Title: 25 Jahre JOSO - Joint Organization for Solar Observations.
Authors: Mattig, W.
1995Stern..71...63M Altcode:
No abstract at ADS
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Title: Dynamics of the solar granulation: bisector analysis
Authors: Hanslmeier, A.; Nesis, A.; Mattig, W.
1994A&A...288..960H Altcode:
Using four selected examples of bisector and line parameter variations
due to granular/intergranular motions in the solar photosphere, we
investigate in this paper the coherence between these parameters over
single granular/intergranular areas. It is shown, that there is no
definite correlation between intensity variations, velocity variations
and the shape of the respective bisectors. This is in contradiction to
some model calculations but is consistent with the results extracted
from spatially highly resolved spectrograms in previous papers. We found
enhancements of the line parameter full width at half maximum at the
granular/intergranular border, non symmetric intensity and velocity
variations around their maxima or minima values and a correlation
between velocity variations on the horizontal scale with the full width
at half maximum values (δfw). However, there is no correlation between
δfw and continuum intensity, because the enhancement of δfw occurs
at moderate values of continuum intensity. Since the full width at
half maximum indicates enhanced non thermal motions, these areas are
the location of post shock turbulence as it is described by newer
hydrodynamical models. These examples are of course influenced by
subjective selection but should be on the other hand also described
by hydrodynamical model calculations.
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Title: Spatial and height changes of oscillations in a sunspot
penumbra
Authors: Marco, E.; Mattig, W.
1994smf..conf..257M Altcode:
No abstract at ADS
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Title: Dynamics of the solar granulation.
Authors: Nesis, A.; Hanslmeier, A.; Hammer, R.; Komm, R.; Mattig,
W.; Staiger, J.
1993A&A...279..599N Altcode:
This investigation is based on a series of spectrograms of extraordinary
spatial resolution taken with the vacuum tower telescope (VTT) at Izana
(Tenerife) in 1990. The quantitative analysis of these spectrograms
reveals an asymmetrical character of the granular flow (non-Benard like
convection). We suggest that a typical granule consists of a region
of high intensity and low turbulence in its interior and a region of
high turbulence and moderate intensity at its border. In other words,
we surmise that reigons of enhanced turbulence outline the borders
of granules. By means of power and coherence analyses we found two
different scaling laws for the small scale range: both the velocity
and intensity power as well as various cross-correlation functions
change their behavior near log k approximately = 0.8.
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Title: Oscillations in sunspots near the solar limb and the influence
of seeing effects
Authors: Federspiel, M.; Mattig, W.
1993A&A...276..227F Altcode:
Oscillations in sunspots near the solar limb were observed by
measuring the variation of their geometric distance to a reference
point (the limb) on time series of spectrograms. Observations carried
out with this recently introduced technique are quite sensitive to
seeing variations. Therefore we present a simple model to estimate the
influence of seeing effects on the observations quantitatively. It turns
out, that under poor seeing conditions the seeing-induced variations of
the spot's position are of the same order of magnitude as the expected
displacements due to oscillations. The strong influence of the seeing
is clearly demonstrated for a series, which was obtained at the Capri
station under unfavourable seeing conditions, in the frequency range
where solar oscillations are expected. <P />A second sunspot was
observed simultaneously under good seeing conditions in Hα, Hβ, the
nearby Fe I 4860 Å line and in the continuum with the VTT equipment
on Tenerife. As a result we find evidence for unusual non-photo spheric
umbral oscillations in the range of 0.7±0.5 mHz and 3.5±0.5 mHz.
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Title: Goals of ground-based solar observations.
Authors: Mattig, W.
1993ESASP1157...33M Altcode: 1993srfs.book...33M
Fruitful observations from spacecraft as well as from ground-based
observatories both require close and coordinated cooperation between
observers and theoreticians. Advantages of ground-based observations
are the possibilities for studying long-term variations (many years),
even outside active regions, and the fact that large telescopes with
complex instrumentation can be used. Disadvantages are the limitations
on the usable wavelength region and the distorting influence of the
Earth's atmosphere. Promising attempts to minimise these distortions
have, however, been made by applying new technologies. Nevertheless,
observations of very small structures (≤0.2 arcsec) in the visible
region over extended periods (many hours) will probably forever remain
the domain of spaceborne instrumentation.
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Title: Dynamics of the solar granulation - Coherence of line
parameters and their variation with the height
Authors: Hanslmeier, A.; Nesis, A.; Mattig, W.
1993A&A...270..516H Altcode:
We give a coherence analysis of various line parameters deduced
from spatially highly resolved solar photospheric spectra obtained
with the VTT at Izana, Tenerife. The high quality of the spectra
and the selection of the wavelength range containing lines of
different strengths allow us to investigate the transition from
coherent to noncoherent flow patterns in the photosphere which occurs
about a height of 150 km. The low correlation values found here are
explained by an enhanced resolution of random motions and phase shifts
between the intensity-velocity coherence which therefore reduces the
coefficients. Two data sets containing a different number of data
samples are compared and show nearly an identical behavior.
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Title: Rapid Variations in the Intergranular Space
Authors: Nesis, A.; Hanslmeier, A.; Hammer, R.; Komm, R.; Mattig,
W.; Staiger, J.
1993ASPC...46..222N Altcode: 1993mvfs.conf..222N; 1993IAUCo.141..222N
No abstract at ADS
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Title: Coherence Analysis of Photospheric Line Parameters in Active
and Non-Active Solar Regions
Authors: Hanslmeier, A.; Mattig, W.; Nesis, A.
1993ASPC...46...36H Altcode: 1993IAUCo.141...36H; 1993mvfs.conf...36H
No abstract at ADS
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Title: Ergebnisse und Probleme der Sonnenforschung.
Authors: Mattig, W.
1992AsSch..29R...6M Altcode:
No abstract at ADS
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Title: What are the Boundaries of Solar Granules?
Authors: Nesis, A.; Hanslmeier, A.; Hammer, R.; Komm, R.; Mattig,
W.; Staiger, J.
1992AAS...180.5109N Altcode: 1992BAAS...24..814N
This investigation is based on a series of spectrograms of extraordinary
spatial resolution taken with the vacuum tower telescope(VTT) at Iza\
na (Tenerife) in 1990. The quantitative analysis of these spectrograms
revealed an asymmetrical character of the granular flow (non-Benard
like convection). The intensity maximum and the maximum of the upward
line-of-sight velocity do not coincide. In most cases the maximum of
the velocity lies near the border of the granule and falls rapidly to
the adjacent intergranular lane(from 1.5 to 0.2kmsec(-1) over 200km),
but moderately towards the other intergranular lane. In some granules
the position with zero velocity coincides with the position of highest
intensity, whereas maxima of velocities with different signs lie at
their border, thus reflecting a typical velocity profile of a rotating
eddy. The low correlation(of less than 0.5) between intensity and
Doppler velocity fluctuations along the spectrograph slit reflects
the asymmetric character of the solar granular flow. Concerning
the border of granules we find that bright regions often exhibit
downward, instead of the expected upward velocity. Moreover, by
investigating the broadening of a non-magnetically sensitive line,
we were able to localize regions with enhanced turbulence within the
intergranular space. We find that these regions do not always cover
the whole intergranular lane, but are concentrated at the border of
the granules, especially where the steep decrease of the velocity
takes place. On the basis of these findings we suggest that a typical
granule consists of a region of high intensity and low turbulence in
its interior and a region of high turbulence and moderate intensity
at its border. In other words, we surmise that regions of enhanced
turbulence outline the borders of granules. Using our time series
of spectrograms, which were taken every 15sec over a total of 5min,
we followed the dynamics of these properties and the evolution of the
steep intensity and velocity changes along the slit. These changes
are connected with shear instabilities and turbulence production. The
findings from non-active regions will be compared with those from
active regions based on magnetically sensitive lines.
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Title: Book Review: Opening the frontiers in solar research /
Pergamon, 1991
Authors: Machado, M. E.; Mattig, W.; Simon, G. W.; Harrison, R. A.
1992Obs...112...70F Altcode:
No abstract at ADS
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Title: Velocity Fluctuations; Energy Dissipation in the Solar
Photosphere
Authors: Komm, R.; Mattig, W.; Nesis, A.
1992ASPC...26..175K Altcode: 1992csss....7..175K
No abstract at ADS
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Title: Dynamics of the solar granulation. I - A phenomenological
approach
Authors: Nesis, A.; Hanslmeier, A.; Hammer, R.; Komm, R.; Mattig,
W.; Staiger, J.
1992A&A...253..561N Altcode:
High-spatial-resolution spectrograms taken with the vacuum tower
telescope in Tenerife were used to investigate the dynamics of the deep
photospheric layers by tracing the motions of small-scale structures
such as granulation. Based on a time series of these spectrograms,
traces of line Doppler shifts were detected which show strong
asymmetries within solar granules. The results are discussed within
the framework of different granulation flow models.
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Title: Bisector; Line Parameter Variation Over a Single Solar Granulum
Authors: Hanslmeier, A.; Mattig, W.; Nesis, A.
1992ASPC...26..168H Altcode: 1992csss....7..168H
No abstract at ADS
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Title: The decay of granular motions and the generation of gravity
waves in the solar photosphere
Authors: Komm, R.; Mattig, W.; Nesis, A.
1991A&A...252..827K Altcode:
The solar photosphere was investigated using a coherence analysis of
rms-velocities. Results confirm that there is a distiction between
the granular structures of the lower photosphere and the secondary
structures of the higher photosphere. It is shown that the conversion
of motions occurs well below a height of 200 km. In the layers of
the higher photosphere (above 170 km) structures are found in the
wavenumber range from 2.5 M/m to 7.0 M/m with a dominant scale of
about 4.0 M/m. It is concluded that secondary motions are generated
by decaying granular motions.
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Title: The height dependence of velocity-intensity fluctuations and
several non-dimensional parameters in the solar photosphere
Authors: Komm, R.; Mattig, W.; Nesis, A.
1991A&A...252..812K Altcode:
The quiet photosphere was studied using autocorrelation functions
(ACFs) of intensity-velocity fluctuations. It is found that all ACFs
get broader with height for the whole center-to-limb variation. For
the length scale L, there is no significant center-to-limb variation
but a general height dependence. In the lower photospheric layers
(less than 150 km), L is of the order of 500 km, while in the higher
layers L increases to 700 km. The vorticity is found to be 0.025/s
in the lower photosphere and 0.001/s in the higher layers. The height
dependence of several independent nondimensional parameters has been
deduced to study the effect of dissipative processes on the granular
motions. The Reynolds number is found to decrease from 5 x 10 exp 9
at the continuum layers to 10 exp 8 at the temperature minimum; the
Peclet number decreases from 70 to 1; and the magnetic Reynolds number
is of the order of 500,000. It is concluded that granules are buoyantly
rising turbulent structures which disintegrate due to turbulent mixing
with the environment.
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Title: The variation of the solar granulation structure in active
and non-active regions
Authors: Hanslmeier, A.; Nesis, A.; Mattig, W.
1991A&A...251..307H Altcode:
With the aid of a coherence analysis between line-center velocities,
continuum-brightness variations and residual intensities the
height-dependent evolution of overshooting convective elements in
the solar photosphere is studied in magnetically active and nonactive
regions. Evidence of a structuring influence of the magnetic field on
the height dependent evolution of temperature and velocity patterns
is found. From a comparison of intensity and velocity-frequency
distributions in nonactive and active regions enhanced downward motions
in active regions were found. The results are in agreement with small
fluxtube concepts.
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Title: Selected examples of bisector and line parameter variation
over a granular-intergranular region
Authors: Hanslmeier, A.; Mattig, W.; Nesis, A.
1991A&A...251..669H Altcode:
Four examples of bisector and corresponding line parameter variations
over a granular-intergranular region are discussed. These detailed
case studies permit a direct comparison with hydrodynamical model
calculations. Generally, the variation of the line parameters is found
to be more similar than for data where granular and intergranular areas
are averaged. However, the transition from granulum to intergranulum
was found to be nonmonotonic and at the position where the velocity
gradients reach a minimum, the slope of the line parameter curves
also changes.
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Title: Granular and intergranular line profiles in solar active and
quiet regions
Authors: Hanslmeier, A.; Mattig, W.; Nesis, A.
1991A&A...248..232H Altcode:
Two spectra obtained with high spatial resolution in active and
nonactive regions of the sun have been analyzed. The enhanced
fluctuations at subgranular scales in active regions observed in
the power spectra of intensity and velocity, provide evidence for
the existence of small magnetic flux tubes. Using the brightest and
darkest continuum, intensity as indicators for granulum-intergranulum,
granular and intergranular line profiles have been determined. In Ca(+)
active regions, the intergranular profiles are changed more than
the granular profiles. Also the full width at half maximum of the
intergranular line profiles is enhanced in the active region. These
results have been obtained without any polarization equipment and
suggest that the magnetic elements are predominantly located in the
intergranular regions.
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Title: High spatial resolution solar photospheric line observations
in Ca(+) active regions
Authors: Hanslmeier, A.; Mattig, W.; Nesis, A.
1991A&A...244..521H Altcode:
Spatially highly resolved solar photospheric line profiles are
analyzed by calculating bisectors, line center velocities, and line
asymmetries in order to investigate the influence of magnetic fields
on these parameters. A set of three spectrograms containing regions
of different magnetic activity is used. In the active regions, a
reduction of continuum intensity fluctuations as well as small-scale
velocity fluctuations is confirmed; however, on subgranual scales,
the continuum intensity fluctuations and line center velocities for
the lines originating higher than 200 km in the troposphere are found
to be increasing in active regions and becoming equal to or higher
than those in nonactive regions. Significant changes are observed in
the profiles: the mean line asymmetry is negative in the nonactive
regions and positive with a reduction of the standard deviation in
the active regions.
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Title: Granulation Spectroscopy: First Results from VTT-Tenerife
Authors: Nesis, A.; Hanslmeier, A.; Hammer, R.; Komm, R.; Mattig,
W.; Staiger, J.
1991BAAS...23R1048N Altcode:
No abstract at ADS
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Title: The small-scale velocity field in the solar photosphere
Authors: Komm, R.; Mattig, W.; Nesis, A.
1991A&A...243..251K Altcode:
The center-to-limb variation of velocity fluctuations derived from
several spectral lines is presented and, from these data, the height
dependence of the vertical and horizontal components of the small-scale
velocity field is deduced. A strong decrease in the lower photosphere
and a flat gradient in the upper photosphere are observed for both the
horizontal and vertical velocity. It is concluded that the convective
motions decay in the middle photosphere up to a height of about 170
km and so-called secondary motions dominate the upper layers of the
photosphere. A stability criterion is used to interpret this conversion
of motions and, by utilizing the Richardson number and several length
scales, it is shown that the stable stratification of the photosphere
causes the decay of the granular convective motions.
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Title: High resolution line profiles in quiet and plage regions of
the sun
Authors: Guenther, E.; Mattig, W.
1991A&A...243..244G Altcode:
High-resolution spectra of plage regions and neighboring quiet regions
in three photospheric lines were obtained using the Sacramento Peak
Tower Telescope. The observations were made in plage regions of a
relatively high magnetic field, showing large differences between
the line profiles of quiet and plage regions. It appears likely that
the magnetic field is stronger in the intergranular lanes than in the
granules, and as the fields are stronger in the intergranular lanes, the
latter change much more than the granules. Canopy type fields of flux
tubes, which are rooted in the intergranular lanes and have a merging
height that is not much higher than the height of formation of the
observed iron lines, could be utilized to explain the observed features.
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Title: Turbulence, fractals, and the solar granulation.
Authors: Brandt, P. N.; Greimel, R.; Guenther, E.; Mattig, W.
1991afa..conf...77B Altcode:
The authors give a brief, mostly qualitative introduction into
the topics of convection and turbulence, and their description,
mainly referring to laboratory experiments. Following Mandelbrot
(1967), the concept of the fractal dimension is introduced and some
earlier results of measurements of the fractal dimension in laboratory
tubulence are discussed. The authors address the question whether hints
of turbulence have been observed in the solar photosphere, and describe
three independent methods of determining the fractal dimension of the
solar granulation: the area-perimenter relation, the line and the plane
intersection method. An analysis of a set of high resolution granulation
photographs taken with the balloon-borne "Spectro-Stratoskop" telescope
yields a fractal dimension of d ≍ 1.9 for granules of diameters
>1.32 arcsec and of d ≍ 1.3 for smaller granules, analysing the
area-perimeter relation of approx. 40000 granules.
---------------------------------------------------------
Title: A comparison of velocity and intensity power spectra in
Ca<SUP>+</SUP> active and non active regions
Authors: Hanslmeier, A.; Mattig, W.
1991AdSpR..11e.263H Altcode: 1991AdSpR..11..263H
From an analysis of velocity powerspectra we found for scales smaller
than 800km that the power in magnetically active regions exceeded the
power in magnetically non active regions. This is in agreement with
the flux tube concept, predicting the confinement of the magnetic
field in small filigree structures. We also found evidence for an
increase of the velocity power contribution at small scales in AR with
photospheric height.
---------------------------------------------------------
Title: Opening frontiers in solar research. Proceedings. Topical
Meeting of the COSPAR Interdisciplinary Scientific Commission E
(Meetings E6 and E9) of the COSPAR 28. Plenary Meeting: Opening
frontiers in solar research, The Hague (Netherlands), 25 Jun -
6 Jul 1990.
Authors: Falciani, R.; Machado, M. E.; Mattig, W.; Simon, G. W.
1991AdSpR..11e....F Altcode: 1991AdSpR..11R....F
Contents: 1. Scientific coordination of solar physics missions in the
1990s (Meeting E6). 2. High-resolution solar physics from space and
the ground (Meeting E9).
---------------------------------------------------------
Title: Oscillations in sunspots near the solar limb
Authors: Mattig, W.; Zerfass, M.
1991A&A...241..212M Altcode:
Using sunspot-spectrograms near the solar limb it is possible to
determine the height of the formation of selected strong (chromospheric)
lines by micrometric distance measurements. The time sequences of
H-alpha and NaD line spectra have been analyzed to check the possibility
of a time variation in the height of formation of these lines. Periods
in the 3 min range, but also longer periods of about 10 min or more,
have been found. The amplitude of the height variation is the range
Delta-h (rms) = 100-200 km. This is a new method to study oscillations
in sunspots, without making use of intensity or velocity variations
but with a low spatial information.
---------------------------------------------------------
Title: Solar Research and Programs of the DFG at Observatorio
del Teide
Authors: Mattig, W.
1991ApL&C..28..157M Altcode: 1991ApL....28..157M
No abstract at ADS
---------------------------------------------------------
Title: On the Dynamics of Granulation in Active Regions and the
Heating Problem (With 2 Figures)
Authors: Nesis, A.; Hanslmeier, A.; Hammer, R.; Komm, R.; Mattig, W.
1991mcch.conf...36N Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Samples of recent high resolution solar observations at
Tenerife
Authors: Wiehr, E.; Mattig, W.
1991AdSpR..11e.199W Altcode: 1991AdSpR..11..199W
The new German telescopes in Izan~a (Tenerife) are now fully
operational. The first spectroscopic observations demonstrate the
outstanding quality of the site. Examples of the first scientific
results are given. They are focused on the fine structure of the
granulation, small fluxtubes and faculae, the Evershed-effect in
sunspots and magnetic field strengths in prominences.
---------------------------------------------------------
Title: Foreword
Authors: Falciani, Roberto; Machado, Marcos E.; Mattig, Wolfgang;
Simon, George W.
1991AdSpR..11e...1F Altcode: 1991AdSpR..11R...1F
No abstract at ADS
---------------------------------------------------------
Title: The height dependence of intensity structures in the solar
photosphere
Authors: Komm, R.; Mattig, W.; Nesis, A.
1990A&A...239..340K Altcode:
The results are presented of a power and coherence analysis of intensity
variations derived from the wings of the solar Mg b2 line. It is found
that the power spectra can be represented by a power law function in
the range of wavenumbers between 2.8/Mm. The deep photosphere shows
the Kolmogorov (-5/3)-scaling law. The values of the exponent and also
of the rms intensity itself decrease with height, attain a minimum,
and increase again. While small structures are coherent up to higher
photospheric layers, the coherence of the larger structures breaks
down in the same layer where the rms intensity shows its minimum. It
is concluded that the large intensity structures reflect the effect
of convective overshoot, and the breakdown of the coherence reflects
the disappearance of convective structures up to a certain height in
the photosphere, while the small structures are of turbulent origin.
---------------------------------------------------------
Title: High spatial resolution observations of some solar photospheric
line profiles
Authors: Hanslmeier, A.; Mattig, W.; Nesis, A.
1990A&A...238..354H Altcode:
Results are presented of high resolution spectroscopic solar granulation
observations with the Gregory Coude Telescope at Izana (Tenerife) in
photospheric nonactive regions. Line asymmetries of four Fe I lines were
analyzed depending on their origination in granular or intergranular
regions. With the increased spatial resolution, instead of the classical
C-shape, red line asymmetries are found in the intergranulum and
blue line asymmetries in the granulum. Correlations between various
line parameters such as continuum intensity, line center velocity,
and equivalent width were examined. The results are in agreement with
theoretical model calculations.
---------------------------------------------------------
Title: Book Review: Particle physics and cosmology / John Wiley, 1989
Authors: Kleczek, J.; Mattig, W.; Kleczek, J.
1990SoPh..129..199K Altcode: 1990SoPh..129..199C
No abstract at ADS
---------------------------------------------------------
Title: Penumbral oscillations in Na D lines
Authors: Marco, E.; Mattig, W.
1990Ap&SS.170...43M Altcode:
Penumbral oscillations were measured in two opposite parts in the
penumbra of a spot, using photographic spectra of Na D lines. Power
spectra of velocities show the presence of the 5-min oscillation
with lowv <SUB>rms</SUB>. Coherence and phase analyses between the
velocity fluctuations of the lines are also studied. The results seem
to show that the 5-min oscillation is still surviving as a standing
or evanescent wave at the height of formation of Na D lines.
---------------------------------------------------------
Title: Line asymmetries in Ca<SUP>+</SUP>-active regions
Authors: Hanslmeier, A.; Mattig, W.
1990Ap&SS.170...51H Altcode:
Spatially-resolved Fe i line bisectors were studied in magnetically
active and non-active regions. In active regions, small-scale velocities
which are of convective origin, were reduced by a factor of 1.9 and
individual bisectors originating in granular-intergranular regions
showed a different behaviour.
---------------------------------------------------------
Title: Observations of Line Asymmetries with a 2-D Diode Array
Authors: Hanslmeier, A.; Wittmann, A. D.; Mattig, W.
1990Ap&SS.170...47H Altcode:
From two-dimensional Reticon spectra obtained at the Gregory Coudé
Telescope (Tenerife) two Fei lines were studied. It is shown that
the resultant line bisectors could be separated according to their
origination in granular-intergranular regions and that the resolved
bisectors no longer had a C-shape form.
---------------------------------------------------------
Title: Book Review: Solar photosphere: structure, convection and
magnetic fields (IAU symposium no. 138) / Kluwer, 1990
Authors: Mattig, W.
1990SoPh..129..199M Altcode: 1990SoPh..129..199S
No abstract at ADS
---------------------------------------------------------
Title: The decay process of the granulation and its influence on
the absorption lines.
Authors: Nesis, A.; Hanslmeier, A.; Hammer, R.; Komm, R.; Mattig, W.
1990AGAb....5...33N Altcode:
No abstract at ADS
---------------------------------------------------------
Title: The Upper Boundary of the Solar Convection Zone -
Hydrodynamical Aspects
Authors: Nesis, Anastasios; Hammer, Reiner; Mattig, Wolfgang
1990ASPC....9..113N Altcode: 1990csss....6..113N
Using spectrograms of high spatial resolution, the horizontal rms
velocity of the granulation is measured at different depths in the
photosphere. A steep vertical gradient of the horizontal velocity is
found, indicating strong dissipation in the first 100 km. Using the
boundary layer concept the dissipation is estimated to be 10 percent of
the total energy. Beyond 200 km, granulation triggers gravity waves. The
turbulent viscosity is estimated to be 10 to the 11th/sq cm/sec.
---------------------------------------------------------
Title: On the fractal dimension of the solar granulation
Authors: Greimel, R.; Brandt, P. N.; Guenther, E.; Mattig, W.
1990VA.....33..413G Altcode:
Fractal dimension analysis may be used to determine whether the solar
granulation represents homogeneous, isotropic turbulence in certain
ranges of scale. Several attempts have been made to investigate
this fractal dimension from white light granulation pictures of
high spatial resolution, e.g. Roudier and Muller (1986), Darvann
and Kusoffsky (1989), and Karpinsky (1990), who find a critical
scale of granule sizes, at which the fractal dimension d changes
abruptly. Using material from the "Spektro-Stratoskop" and analysing 42
742 granules, we could confirm the results published earlier, i.e. a
fractal dimension of approx. 1.3 for the small scales and d ≈ 2 for
the large scales. However, we find a smooth transition between both
regimes. Moreover, a closer inspection of the methods used reveals,
that in all analyses the fractal dimension of the granulation at
small scales seems to be dominated by technical problems, i.e. the
limited resolution of the material, the definition of the granules,
and — last but not least — the finite pixel size.
---------------------------------------------------------
Title: The Influence of the Granulation on the Absorption Lines
I. Nonactive Regions
Authors: Nesis, A.; Hanslmeier, A.; Hammer, R.; Komm, R.; Mattig, W.
1990PDHO....7..108N Altcode: 1990ESPM....6..108N; 1990dysu.conf..108N
No abstract at ADS
---------------------------------------------------------
Title: The new filter device at the Vacuum Tower Telescope at the
Observatorio del Teide.
Authors: Kentischer, T.; Mattig, W.
1990AGAb....5..100K Altcode:
No abstract at ADS
---------------------------------------------------------
Title: On the fractal dimension of the solar granulation.
Authors: Greimel, R.; Brandt, P. N.; Guenther, E.; Mattig, W.
1990AGAb....5....7G Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Influence of Magnetic Fields on Temperature Inhomogeneities
Authors: Hanslmeier, A.; Mattig, W.
1990PDHO....7..102H Altcode: 1990dysu.conf..102H; 1990ESPM....6..102H
No abstract at ADS
---------------------------------------------------------
Title: Oscillations above sunspots near the limb.
Authors: Federspiel, M.; Mattig, W.
1990AGAb....5....8F Altcode:
No abstract at ADS
---------------------------------------------------------
Title: On the line asymmetry distribution in solar Ca<SUP>+</SUP>
active and non active regions.
Authors: Hanslmeier, A.; Mattig, W.
1990AGAb....5...39H Altcode:
No abstract at ADS
---------------------------------------------------------
Title: The height dependence of vertical and horizontal velocities
attributed to the convective overshoot in the solar atmosphere
Authors: Nesis, A.; Mattig, W.
1989A&A...221..130N Altcode:
The paper presents the results of an analysis of the variation of the
granular velocity fluctuations with height in the photosphere. For
the vertical and horizontal granular velocity fluctuations a steep
gradient in the deep photosphere, a velocity minimum, and a rise of
the velocity above this minimum were found. It is argued that within
these convective overshoot layers the ordered convective motion is
converted gradually into another type of motion thereby inducing the
velocity field of the higher photospheric layers.
---------------------------------------------------------
Title: New results on the hydrodynamics of the overshoot layers in
"active regions"
Authors: Nesis, A.; Fleig, K. -H.; Mattig, W.
1989hsrs.conf..321N Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Line assymetries and parameters in spatially highly resolved
spectra
Authors: Hanslmaier, A.; Mattig, W.; Nesis, A.
1989hsrs.conf..314H Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Results on the height dependence of granular velocity
fluctuations
Authors: Komm, R.; Mattig, W.
1989hsrs.conf..330K Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Granulation Line Asymmetries
Authors: Mattig, W.; Hanslmeier, A.; Nesis, A.
1989ASIC..263..187M Altcode: 1989ssg..conf..187M
No abstract at ADS
---------------------------------------------------------
Title: RMS Velocities in Solar Active Regions
Authors: Nesis, A.; Fleig, K. -H.; Mattig, W.
1989ASIC..263..289N Altcode: 1989ssg..conf..289N
No abstract at ADS
---------------------------------------------------------
Title: Dependence of solar line bisectors on equivalent widths.
Authors: Hanslmeier, A.; Mattig, W.; Nesis, A.
1989sasf.confP.251H Altcode: 1988sasf.conf..251H; 1989IAUCo.104P.251H
Spectroscopic highly resolved solar granulation observations lead to
intense line asymmetries for rising and sinking elements. In order to
average several granules it is better to use equivalent widths than
continuum intensities.
---------------------------------------------------------
Title: Intensity-Velocity Correlation in active and non-active
solar areas
Authors: Hanslmeier, A.; Mattig, W.
1989AGAb....3....7H Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Oscillations in sunspots near the solar limb.
Authors: Mattig, W.; Zerfass, M.
1988ESASP.286..273M Altcode: 1988ssls.rept..273M
Using sunspot-spectrograms near the solar limb it is possible to
determine the height of the formation of selected strong (chromospheric)
lines by micrometric distance measurements. The authors have analysed
the time sequences of Hα and Na D linespectra to check the possibility
of a time variation in the height of formation of these lines. They
have found periods in the 3 minutes range, but also longer periods. The
amplitude of the height variation is in the range Δh(rms) = 100 -
200 km. This is a new method to study oscillations in sunspots,
without making use of intensity or velocity variations.
---------------------------------------------------------
Title: Overshoot of horizontal and vertical velocities in the deep
solar photosphere
Authors: Nesis, A.; Mattig, W.; Durrant, C. J.
1988A&A...201..153N Altcode:
The authors present the results of a coherence analysis of the
centre-to-limb behaviour of the small-scale intensity and velocity
fluctuations. The vertical velocity is coherent throughout the
low-middle photosphere and is correlated with the continuum intensity
variations. The horizontal velocity variations are not coherent with the
intensity variations, and with the vertical velocity variations. The
horizontal velocity is coherent only in the low atmosphere. Thus the
horizontal motion is independent from the vertical motion and is not
of convective nature.
---------------------------------------------------------
Title: The gradient of the small-scale velocity fluctuation in the
solar atmosphere
Authors: Nesis, A.; Fleig, K. H.; Mattig, W.; Wiehr, E.
1987A&A...182L...5N Altcode:
The vertical small-scale velocity gradient in the photosphere is
determined using spectrograms of high spatial resolution obtained with
the Gregory-Coude telescope in Izana on August 1, 1986. The measured
Doppler shifts along the spectrograph slits are analyzed using spatial
Fourier analysis. The height dependence of the size of the velocity
fluctuations measured at Doppler velocity is examined. It is observed
that both the amplitude of the smallest velocity structures and
the integrated rms small-scale velocity decrease with height in the
photosphere. The derived rms small-scale velocity values are compared
with the data of Canfield (1976) and Nesis (1985), and good correlation
is observed.
---------------------------------------------------------
Title: The gradient of the small-scale velocity fluctuation in the
solar atmosphere
Authors: Nesis, A.; Mattig, W.; Fleig, K. H.; Wiehr, E.
1987BAAS...19..942N Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Proceedings of the workshop on adaptive optics in solar
observations,Freiburg, September 8 - 9, 1987.
Authors: Merkle, F.; Engvold, O.; Falomo, R.; Mattig, W.
1987pwoa.book.....M Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Joint Discussion on Topics of Sessions 3 and 4
Authors: Stenflo, J. O.; Mattig, W.
1987rfsm.conf..116S Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Granulare Overshoot-Schichten als Randbedingungen
Authors: Nesis, A.; Komm, R.; Mattig, W.
1986MitAG..67..289N Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Einiges zur Streulichtkorrektur
Authors: Komm, R.; Hessenbruch, A.; Mattig, W.
1986MitAG..67..286K Altcode:
No abstract at ADS
---------------------------------------------------------
Title: The LEST-Project
Authors: Mattig, W.
1986MitAG..67..258M Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Tagung zur Vorbereitung des ersten SOT(Solar Optical
Telescope)-Fluges in München.
Authors: Mattig, W.
1985S&W....24..632M Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Oscillations of the sun's chromosphere. III - Simultaneous
H-alpha observations from two sites
Authors: von Uexkuell, M.; Kneer, F.; Mattig, W.; Nesis, A.;
Schmidt, W.
1985A&A...146..192V Altcode:
The authors analyze time sequences of Hα filtergrams taken
simultaneously from two distant observatories, Capri and Izaña. By
means of a coherence analysis the authors discriminate between
instrumental effects including seeing and truly solar intensity
fluctuations. Waves with periods as short as 60 s are present in the
solar chromosphere; the lower limit is set by the time resolution of
the observations.
---------------------------------------------------------
Title: The High Resolution Structure of the Sun
Authors: Mattig, W.
1985LNP...233..141M Altcode: 1985hrsp.proc..141M
Observations of granulations, subgranular structures, and sunspots
are discussed. The granule-intergranule contrast is examined. The
intensity, velocity, and temperature fluctuations, and the height
dependence of the granular structure are analyzed. The relation between
the diameter of the granules and the umbral magnetic field strength is
investigated. High resolution observations reveal small bright points
of less than 1 arcsec across the solar disc and filigrees embedded
in the granular pattern. The intensity of the filigree structure and
the spatial distribution of the bright points are considered. Solar
structures observed during rocket flights are studied. The
characteristics of the penumbra and umbra of sunspots are described.
---------------------------------------------------------
Title: Die Chromosphäre über Sonnenflecken.
Authors: Mattig, W.
1984S&W....23..559M Altcode:
Research findings on the nature of the chromosphere over sunspots
is reviewed. The development of models of the sunspot-chromosphere
is recapitulated, and observational findings on the structure and
oscillations of the sunspot-chromosphere are discussed. Filtergrams of
the region are shown and the temporal behavior of important spectral
lines is presented.
---------------------------------------------------------
Title: Chromospheric umbral oscillations.
Authors: Mattig, W.; von Uexküll, M.; Kneer, F.
1984ESASP.220...59M Altcode: 1984ESPM....4...59M
No abstract at ADS
---------------------------------------------------------
Title: Phase-spectra of solar oscillations
Authors: Staiger, J.; Mattig, W.; Schmieder, B.; Deubner, F. -L.
1984MmSAI..55..147S Altcode:
Diode array measurements of intensity- and velocity-oscillations
were made at the coude-telescope of Capri. From these observations
phase-spectra were calculated to identify different types of waves
within the solar atmosphere. The results indicate the existence of
atmospheric gravity modes in the frequency-range below 2.5 mHz. No
running acoustic waves were found in the photosphere for frequencies
beyond 7.5 mHz. Vertical propagation seems only to take place for
frequencies between 5 mHz and 7.5 mHz. No vertical propagation at
all was found in the upper chromosphere. This seems to be due to the
occurrence of wave reflection at the chromosphere-corona interface.
---------------------------------------------------------
Title: Welche Bedeutung haben partielle Sonnenfinsternisse für
die Sonnenphysik?
Authors: Mattig, W.
1984S&W....23..190M Altcode:
The use of solar-eclipse observations to correct for instrument
and atmospheric effects in investigating solar phenomena is
reviewed. Phenomena and techniques discussed include determining the
dimensions of solar structures (resolution 40 km) from the moon's
motion, measuring the true intensity of sunspot umbras by subtracting
the scattered light measured on the moon's edge, calculating the
actual limb-darkening function using the observed intensity drop at
the moon's edge, and estimating the intensity fluctuations of the solar
granulation and the velocity fluctuations of the solar surface. Graphs
and photographs are provided.
---------------------------------------------------------
Title: Studies of Overshoot
Authors: Nesis, A.; Durrant, C. J.; Mattig, W.
1984ssdp.conf..243N Altcode:
The authors present the results of a power and coherence analysis
of the centre-to-limb behavior of the small-scale intensity and
velocity fluctuations. The vertical velocity is coherent throughout the
low-middle photosphere and is correlated with the continuum brightness
pattern. The horizontal velocity pattern is not coherent with the
vertical velocity and brightness patterns indicating lack of horizontal
heat transport. The horizontal velocity patterns are coherent only in
the low atmosphere. The mechanism causing the breakdown of coherence
may be a property of the convective flow or the intrusion of a gravity
wave field.
---------------------------------------------------------
Title: LEST-Foundation gegründet.
Authors: Mattig, W.
1984S&W....23...64M Altcode:
No abstract at ADS
---------------------------------------------------------
Title: On the instrumental and atmospheric stray-light for solar
observations.
Authors: Mattig, W.
1983SoPh...87..187M Altcode:
From aureole measurements made with a 40 cm-Vacuum-Telescope at Izaña
(Tenerife) in the wavelength region 417 nm < λ < 785 nm and from
a comparison with other aureole measurements we conclude the following:
(a) Within one solar radius from the limb, the aureole is mostly
of instrumental origin, (b) Beyond that distance, the contribution
of atmospheric stray-light becomes noticeable, (c) The atmospheric
contribution to the aureole intensity is, under good conditions at
mountain stations, a very slowly decreasing function, and amounts to
some 10<SUP>−5</SUP> of the solar disk intensity.
---------------------------------------------------------
Title: The chromosphere above sunspot umbrae. IV. Frequency analysis
of umbral oscillations.
Authors: von Uexküll, M.; Kneer, F.; Mattig, W.
1983A&A...123..263V Altcode:
The authors analyse time sequences of photographic spectrograms in Ca II
H, K, 8498 Å, and 8542 Å, in Sodium D<SUB>1</SUB> and D<SUB>2</SUB>,
in Ni I 5893 Å and Hα, obtained from two sunspots. The frequency
analysis of line intensities and shifts for the umbral chromospheric
oscillations in the period range 110 s-200 s is discussed.
---------------------------------------------------------
Title: Balloon-borne imagery of the solar granulation. IV - The
centre-to-limb variation of the intensity fluctuations
Authors: Durrant, C. J.; Mattig, W.; Nesis, A.; Schmidt, W.
1983A&A...123..319D Altcode:
A reanalysis of the white-light photographs of the granulation obtained
during the flight of the balloon-borne Spektrostratoskop experiment
is presented. A detailed examination of the power spectra of the
intensity fluctuations at various times during the flight reveals a
steady increase in a straylight and a substantial degree of astigmatism
that changed with the focus setting. Allowing for the latter and
normalizing all measurements to that with the least straylight, the
rms relative intensity fluctuation at the center of the disk at 556 nm
is increased from the previously reported value of 8.6 percent to 11.3
percent. The overall change of rms fluctuation from the center of the
disk to 0.3 micron is remarkably small, dropping some 10 percent. The
results agree quite well with those of the Soviet Solar Stratospheric
Observatory, when corrected roughly for instrumental degradation, and
with a granulation model in which the granular temperature perturbation
cuts off at a height of 35 km in the atmosphere.
---------------------------------------------------------
Title: The chromosphere above sunspot umbrae. IV - Frequency analysis
of umbral oscillations
Authors: Uexkuell, M. V.; Kneer, F.; Mattig, W.
1983A&A...123..263U Altcode:
An analysis is made of time sequences of photographic spectrograms in Ca
II H, K, 8498 A, and 8542 A, in sodium D1 and D2, and in Ni I 5893 A and
H-alpha obtained from two sunspots with the Vacuum Tower Telescope at
Sacramento Peak Observatory. The two sunspot chromospheres are found to
behave similarly with regard to their phase relationships but somewhat
differently with regard to the oscillation resonant frequencies. In one
and the same umbra, oscillation modes having different frequencies may
be excited. The vertical velocity of propagation of the phase in umbral
chromospheres, which is 10-25 km/s, decreases with increasing frequency
and is much lower than the Alfven speed. The umbral chromospheric
oscillations are thus slow mode waves. The downward motion enhances
the intensity by some 65 deg (H-alpha) to 85 deg (D1), indicating
dissipation of mechanical energy. It is also found that the mechanical
energy flux of the umbral chromospheric oscillations is not sufficient
to account for the chromospheric radiative losses.
---------------------------------------------------------
Title: Die Mitte-Rand-Variation des granularen Geschwindigkeitsfeldes
Authors: Nesis, A.; Durrant, C. J.; Mattig, W.
1983MitAG..60..279N Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Johannes Peter Mehltretter.
Authors: Mattig, W.
1983MitAG..59....9M Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Zur Struktur der Chromosphäre über Sonnenflecken
Authors: Kneer, F.; Mattig, W.; von Uexküll, M.
1982MitAG..55...65K Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Handbuch für Sonnenbeobachter.
Authors: Beck, R.; Belter, M.; Bendel, U.; Bruns, H. -J.; Dobrzewski,
J.; Fritz, U.; Gericke, V.; Hänel, A.; Hammerschmidt, S.; Hilbrecht,
H.; Jahn, J.; Lille, W.; Merz, A.; Monstein, C.; Mattig, W.; Neue,
G.; Paech, W.; Reinsch, K.; Remmert, E.; Schmidt, I.; Schmiedeck,
W.; Schröder, K. -P.; Seeck, A.; Staps, D.; Topcubasi, T.; Treutner,
H.; Völker, P.; Vogt, O.; Wedel, B.
1982hfs..book.....B Altcode:
Contents: Instrumente und Hilfsmittel. Refraktor
oder Reflektor. Zusatzgeräte am
Okularauszug. Lichtdämpfung. Spezialgeräte. Fotografie. Auswertung
von Fotos. Kinematografie und Video. Beobachtung
und Auswertung. Beobachtung. Sonnenflecken.
Positionsbestimmung. Wilson-Effekt. Lichtbrücken. White Light
Network. Photosphärische Fackeln. Granulation. Amateurmäßige
Magnetfeldbeobachtungen. Sonnenbeobachtung imH-alpha-Licht.
Sonnenfinsternisse. Sonnenfinsternisexpeditionen. Beobachtbare
Phänomene.
---------------------------------------------------------
Title: Einfluß von Temperaturinhomogenitäten in der
Sonnenatmosphäre auf die Bestimmung von Elementhäufigkeiten
Authors: Hermsen, W.; Holweger, H.; Mattig, W.
1982MitAG..55...91H Altcode:
No abstract at ADS
---------------------------------------------------------
Title: The chromosphere above sunspot umbrae. III - Spatial and
temporal variations of chromospheric lines
Authors: Kneer, F.; Mattig, W.; v. Uexkuell, M.
1981A&A...102..147K Altcode:
The lines Ca II H, K, 8542 A, Na I D(1) and D(2), Ni I 5893 A, and
H-alpha, were analyzed in photographic spectrograms obtained from a
sunspot. The following results are found for the umbra: (1) the H and K
lines are highly correlated, with an emission cores maximum-intensities
ratio of 1.2; (2) the K intensities are poorly correlated with those
of 8542, D(2), and H-alpha; this behavior is attributed to atmospheric
structure horizontal fluctuations having little correlations between
those in high and low layers, (3) the periodic temporal fluctuations
of the K emission core with umbral flashes are identified, and found to
occur throughout the umbral area covered by the spectrograph slit; and
(4) fluctuations in the photospheric Ni I 5893 A line cannot be matched
to the chromospheric fluctuations, in accord with Giovanelli (1978).
---------------------------------------------------------
Title: Solar granulation study in partial eclipse conditions using
speckle interferometric techniques
Authors: Ricort, G.; Aime, C.; Deubner, F.; Mattig, W.
1981A&A....97..114R Altcode:
During the partial eclipse of April 29, 1976, photoelectric
speckle-interferometric measurements of solar granulation were obtained
using the 35 cm domeless coudé refractor of the Kiepenheuer Institute,
operated at the Anacapri Island observatory. <P />A radial cut of
the two-dimensional power spectrum of the intensity distribution was
calculated and the empirical modulation transfer function (M.T.F.),
determined from the lunar limb profile, was used for correcting the
data. This experimental M.T.F. which contains the combined effects
of instrumental diffraction and atmospheric seeing is found to be
in very good agreement with Korff's theoretical model computed for
a Fried parameter r0 equal to 2.3 cm. <P />The corrected intensity
fluctuation (ΔI)r.m.s.= 16.5% for λ=5300 A. The maximum power is
found to be split into two components located respectively at 0.2 and
0.4 cycles per arc second. The shape of the power spectrum confirms
the fall in energy towards very low spatial frequencies, whereas the
poor precision obtained in the high frequency range cannot permit an
exponential decrease of the solar granulation power spectrum to be
confirmed or refuted.
---------------------------------------------------------
Title: Granular-size horizontal velocities in the solar atmosphere
Authors: Mattig, W.; Mehltretter, J. P.; Nesis, A.
1981A&A....96...96M Altcode:
Observations of horizontal motions in the granulation of the solar
photosphere and the center-to-limb variations are reported. Measurements
of the Fe I 5121.649, Cr I 5122.121 and Fe I 5123.730 lines were
obtained by the balloon-borne spectro-stratoscope with slit direction
tangential to the limb. Following correction for known instrumental
effects, rms line velocities are found to increase towards the limb,
and to contain a horizontal component approximately twice as large as
the vertical component. The results are noted to be in agreement with
those of Keil and Canfield (1978) at lower photospheric heights, and
those of Beckers and Canfield (1975) at greater photospheric heights.
---------------------------------------------------------
Title: OSO-8 Observations of CAII H and K MGII H and K Lyman-Alpha
and Lyman-Beta above a Sunspot
Authors: Kneer, F.; Scharmer, G.; Mattig, W.; Wyller, A.; Artzner,
G.; Lemaire, P.; Vial, J. C.
1981SoPh...69..289K Altcode:
Observations with the French (L.P.S.P.) experiment on board OSO-8 of
a sunspot and nearby plage region are described. The behaviour of the
emission cores of the Ca II H and K and Mg II h and k resonance lines is
very similar and the correspondence in intensity between the four lines
persists in all observed features. In contrast, the Lyman lines show
little correlation with the other lines. Their emission regions appear
broader in the spectroheliograms than the underlying sunspot structure
and must not necessarily possess a counterpart in lower layers. From
the central intensity of Lα above the umbra an electron density of
4.3 × 10<SUP>10</SUP> cm<SUP>-3</SUP> ≲n<SUB>e</SUB><SUP>*</SUP>
≲2.3 × 10<SUP>11</SUP> cm<SUP>-3</SUP> at 20 000 K is estimated.
---------------------------------------------------------
Title: Sonnenfleckenchromosphären und der Wilson-Bappu-Effekt
Authors: Mattig, W.
1981MitAG..52Q.114M Altcode:
No abstract at ADS
---------------------------------------------------------
Title: The Chromosphere above Sunspot Umbrae - Part Three - Spatial
and Temporal Variations of Chromospheric Lines
Authors: Kneer, F.; Mattig, W.; Uexkull, M. V.
1981phss.conf..318K Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Sunspot chromospheres and their relation to the chromospheres
of laten main sequence stars.
Authors: Mattig, W.; Kneer, F.
1981A&A....93...20M Altcode:
The sunspot umbra parameters such as spectral type, effective
temperature, and chromospheric Ca II H and K line emission are related
to the same parameters of luminosity class V stars of spectral type
G 8 to M 2. The sunspots follow the Wilson-Bappu relation. It is
concluded that the strong magnetic fields in umbrae may control the
nonradiative energy supply of the sunspot chromosphere; however, the
heating mechanism is not reflected in the average appearance of the
H and K line cores.
---------------------------------------------------------
Title: Coherence Analysis of Granular Intensity
Authors: Kneer, F. J.; Mattig, W.; Nesis, A.; Werner, W.
1980SoPh...68...31K Altcode:
A high resolution spectrogram of the Mg b<SUB>2</SUB> line from the
quiet Sun disc centre is subjected to a coherence analysis. We find
that the coherence between intensity fluctuations in the continuum
and the wings of the line breaks down at a distance Δλ = 0.35
Å from line centre. From this and the r.m.s. intensity contrast
as a function of Δλ we are led to the following simple model of
temperature fluctuation δT in the solar photosphere: A lower part
(below 50 km, or τ<SUB>5000</SUB> > 0.25) with strongly inward
increasing δT and an upper part (above 50 km) with constant δT =
75 K. The two parts are supposed to fluctuate incoherently.
---------------------------------------------------------
Title: The mean vertical velocity of solar granulation
Authors: Mattig, W.
1980A&A....83..129M Altcode:
Direct measurements of vertical granular velocity fluctuations in
spatially resolved spectrograms and the methods of their correction for
the influence of atmospheric and instrumental smearing are critically
discussed. An independent correction of the observations by Canfield
and Mehltretter (1973) and by Keil and Canfield (1978) is reported. A
vertical granular velocity component (without the oscillations) of
0.8-1.2 km/s (rms) is obtained, which is very weakly dependent on
height. These values are larger than the theoretical predictions by
Nelson and Musman (1977) and constitute the main component of local
'macroturbulent' broadening of unresolved line profiles.
---------------------------------------------------------
Title: On the center to limb variation of the granular brightness
fluctuations.
Authors: Schmidt, W.; Deubner, F. -L.; Mattig, W.; Mehltretter, J. P.
1979A&A....75..223S Altcode:
The center to limb variation of the granular brightness contrast
was studied on the basis of slit-jaw photographs obtained with the
balloon-borne Spektro-Stratoskop telescope, flown at an altitude of
about 28 km on May 17, 1975 and during the partial solar eclipse of
April 26, 1976 on Tenerife. Positions concentrate at cosine theta
values of about 1, 0.6 and 0.2. The granular contrast was found to
decrease monotonically towards the solar limb, with the magnitude of
contrast about three times smaller at cosine theta 2 than at the disk
center. The relative center to limb variation was found to be 10.4%
(eclipse observations by a 40 cm evacuated Newtonian reflector at 422
nm) and 8.6% (Spektro-Stratoskop observations at 556 nm). Discrepancies
between these results and those reported by Deubner and Mattig (1975)
are thought to be due to corrections for photographic noise and other
factors.
---------------------------------------------------------
Title: Studies of granular velocities. VIII. The height dependence
of the vertical granular velocity component.
Authors: Durrant, C. J.; Mattig, W.; Nesis, A.; Reiss, G.; Schmidt, W.
1979SoPh...61..251D Altcode:
Spectral observations of solar velocity fields made during a partial
solar eclipse are described. Continuum intensity measurements at
the lunar limb allow the modulation transfer function to be derived
and the true spatial power spectrum of the velocity field to be
reconstructed. The oscillatory and granular components are separated
by applying spatial filters cutting off at 3″.7. The oscillatory
component values are in good agreement with those of Canfield (1976) but
the granular component has substantially more power and a smaller height
gradient. The discrepancy can be resolved by noting the uncertainties
of the seeing corrections and of the separation into components in
the work of Canfield.
---------------------------------------------------------
Title: Die Mitte-Rand-Variation des granularen Intensitätskontrastes
Authors: Schmidt, W.; Deubner, F. L.; Mattig, W.; Mehltretter, J. P.
1979MitAG..45..148S Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Die Höhenabhängigkeit der vertikalen granularen
Geschwindigkeitskomponente
Authors: Durrant, C. J.; Mattig, W.; Nesis, A.; Reiss, R.; Schmidt, W.
1979MitAG..45..149D Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Project Spectrostratoscope: Balloon-borne solar research
Authors: Mehltretter, J. P.; Mattig, W.; Vonalvensleben, A.
1978fifg.rept.....M Altcode:
A historical review of the project development (1961 to 1975) is
followed by an outline description of the instrument. More details
on the technical problems related to photometry and the quantitative
analysis of the observations are then given. Focusing, instrument
profile, instrumental polarization, pointing, and guiding stability
are discussed. After a brief description of the balloon flight of
17 May 1975, The functioning of critical components and the thermal
behavior of the instrument are analyzed. The scientific program for
the investigation of photospheric granulation by means of time series
integrated light pictures and spectra with high angular and spectral
resolutin is described; first results concerning life times temperature
fluctuations, and velocities of granules are reported.
---------------------------------------------------------
Title: The Chromosphere above Sunspot Umbrae II. The Interpretation
of the H, K and IR Lines of CA II
Authors: Kneer, F.; Mattig, W.
1978A&A....65...17K Altcode:
Summary. The chromospheres above sunspot umbrae are investigated
by comparing calculated and observed profiles of the Ca ii H, K,
and infra-red lines. Statistical steady state is assumed for the
level populations. We test several model chromospheres in hydrostatic
equilibrium. We distinguish between chromospheres which are optically
thick and optically thin at the centre of the K line. In view of the
observed intensity ratio 1K3/1H3 1.15 we are forced to adopt a thick
model as reference chromosphere. Key words: chromosphere - sunspot
umbra - Ca ii lines
---------------------------------------------------------
Title: The chromosphere above sunspot umbrae. I. Observations of
the emission cores in the Ca II H- and K-lines.
Authors: Mattig, W.; Kneer, F.
1978A&A....65...11M Altcode:
Summary. Photographic spectra of the Ca ii H- and K- lines in sunspot
umbrae are analysed. The emission features in the line profiles may be
classified into minimum emission profiles that also lack self-reversal,
and profiles which change rapidly in time and exhibit self-reversals
(umbral flashes) that are most often strongly asymmetric. Average
intensity profiles from the minimum emission parts of the umbra and
characteristic intensities of the more active parts of the umbra are
given. Key words: chromosphere - sunspot umbra - Ca ii lines
---------------------------------------------------------
Title: Das geplante Sonnenobservatorium auf den Kanarischen Inseln.
Authors: Mattig, W.
1978S&W....17...51M Altcode:
Sites in southern Europe were evaluated in terms of their suitability
for the stationing of a vacuum solar telescope. La Palma and Tenerife
in the Canary Islands were eventually selected because of their low
daily and seasonal temperature variations, and the high level of
atmospheric stability encountered in that region. A 60 cm telescope,
already under construction in Germany, and designed with the cooperation
of the 12-nation Joint Organization for Solar Observation (JOSO), is
described. The important data for the telescope are: coelostat with
a 2 x 80 cm plane mirror, 70 cm spherical mirror, spectrograph with a
15 m focal length, and Echelle-screen with a surface of 420 x 220 mm
and 79 lines/mm. The telescope will be situated in a 30 meter tower.
---------------------------------------------------------
Title: Chromosphärenmodell von Sonnenflecken
Authors: Kneer, F.; Mattig, W.
1978MitAG..43..141K Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Das geplante Sonnenobservatorium auf den Kanarischen Inseln
Authors: Mattig, W.
1978MitAG..43...32M Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Korrektur von gemessenen granularen Geschwindigkeiten aus
Sonnenfinsternisbeobachtungen
Authors: Mattig, W.; Nesis, A.; Reiss, G.
1977MitAG..42..114M Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Fraunhofer-Institut mit den Observatorien Schauinsland und
Anacapri. Report for 1976.
Authors: Mattig, W.; Schroeter, E. H.
1977MitAG..41...81M Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Studies of granular velocities. VII: Granular velocities
around sunspots.
Authors: Mattig, W.; Nesis, A.
1976SoPh...50..255M Altcode:
Vertical small scale velocities deduced from highly resolved spectra
in the center of the solar disk, obtained with a RCA image intensifier
tube, are discussed. As a main result we find that the velocities of
small elements (< 2″) are remarkably larger in active regions
around sunspots than in the quiet Sun. In both cases the velocities
decrease with height in the solar atmosphere (Figure 2).
---------------------------------------------------------
Title: Änderungen des Geschwindigkeitsfeldes in aktiven Gebieten
durch das Magnetfeld
Authors: Mattig, W.; Nesis, A.
1976MitAG..40Q.162M Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Fraunhofer-Institut mit den Observatorien Schauinsland und
Anacapri. Report 1975.
Authors: Mattig, W.
1976MitAG..39...68M Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Makroskopische Geschwindigkeiten in der unmittelbaren Umgebung
von Sonnenflecken.
Authors: Mattig, W.; Nesis, A.
1976MitAG..38..217M Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Nachrufe : Karl-Otto Kiepenheuer
Authors: Mattig, W.
1976MitAG..38...11M Altcode:
No abstract at ADS
---------------------------------------------------------
Title: New observations of the granular intensity fluctuations.
Authors: Deubner, F. L.; Mattig, W.
1975A&A....45..167D Altcode:
White-light photographs of solar granulation obtained with a
40-cm evacuated reflector during the partial eclipse of June 30,
1973, are used for a statistical analysis of granular intensity
fluctuations. Two-dimensional power spectra of the intensity
distribution are calculated directly, and an instrument spread function
derived from photometric scans across the lunar limb is employed for
correcting the data. The mean FWHM of the spread function corresponded
to 0.52 sec. The corrected RMS intensity fluctuation is found to be
0.128 for a wavelength of 607 nm, and maximum power is found to occur
at the wave number corresponding to a wavelength of 1340 km or 1.85 sec.
---------------------------------------------------------
Title: Die Intensitätsfluktuation der Granulation
Authors: Deubner, F. L.; Mattig, W.
1975MitAG..36..148D Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Granulare Geschwindigkeiten in der Nähe von Sonnenflecken
Authors: Mattig, W.; Nesis, A.
1975MitAG..36..147M Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Studies of Granular Velocities. VI: Changes in the Granular
Velocity Field around Sunspots
Authors: Mattig, W.; Nesis, A.
1974SoPh...38..337M Altcode:
Observations with the image intensifier tube at the Coudé refractor in
Capri seem to confirm that the velocity field near sunspots contains
more small scale fluctuations than in non-active regions, and that
these fluctuations decrease more rapidly with height.
---------------------------------------------------------
Title: Sub- and Superhydrostatic Equilibrium in Sunspots
Authors: Mattig, W.
1974SoPh...36..275M Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Studies of Granular Velocities. IV: Statistical Analysis of
Granular Doppler-Shifts
Authors: Mattig, W.; Nesis, A.
1974SoPh...36....3M Altcode:
We present a statistical analysis of local Doppler shifts measured in
the line λ6302.5 of Fe I. The main results are: If the oscillatory
component is separated from the fluctuations of velocity, a granular
rms velocity of about 200 m s<SUP>−1</SUP> is left over, which is
strongly influenced by seeing.
---------------------------------------------------------
Title: Studies of Granular Velocities. V: The Height Dependence of
the Granular Doppler Shifts
Authors: Mattig, W.; Schlebbe, H.
1974SoPh...34..299M Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Das Sonnenobservatorium auf dem Schauinsland.
Authors: Mattig, W.
1974S&W....13..259M Altcode:
No abstract at ADS
---------------------------------------------------------
Title: The Quiet Sun
Authors: Mattig, W.
1973lsp2.conf....7M Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Solar Magnetic Field Observations
Authors: Mattig, W.
1973lsp2.conf...25M Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Astronomische Beobachtungen und kosmologische Modelle.
Authors: Mattig, W.
1973coco.conf..169M Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Statistische Analyse granularer Dopplerverschiebungen
Authors: Mattig, W.; Nesis, A.
1973MitAG..34..114M Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Granulare Geschwindigkeiten in der Sonnenatmosphäre
Authors: Nesis, A.; Mattig, W.
1972MitAG..31..150N Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Über die große Sonneneruption Anfang August 1972.
Authors: Born, R.; Brandt, P.; Mattig, W.; Wöhl, H.
1972S&W....11..339B Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Observations of Stray-Light and Sunspot Intensities during
the Mercury Transit of 1970 May 9
Authors: Mattig, W.
1971SoPh...18..434M Altcode:
In order to test the usual method for correcting sunspot intensity
measurements for stray light, we have measured, during the Mercury
transit of 1970 May 9, the intensities of Mercury, a sunspot
umbra, and the aureole. The direct observations result in Mercury
intensities < 0.06 I<SUB>⊙</SUB> and aureole intensities <0.01
I<SUB>⊙</SUB>. The stray light correction to the spot intensities
has been <(0.03 ± 0.01) I<SUB>⊙</SUB>. The main contribution
to the stray light on the solar disc is shown to be produced by
a spread-function with a half width of 10 arc sec. Consequently,
for stray light corrections the range R ⩽ R<SUB>⊙</SUB> + +
20″ in the aureole has to be measured very precisely; furthermore,
a remarkable fraction of the stray light in the center of an umbra
originates from the surrounding penumbra.
---------------------------------------------------------
Title: Sonnenfleckenintensität und Streulichtmessungen während
des Merkurdurchganges am 9. Mai 1970
Authors: Mattig, W.
1971MitAG..30..137M Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Studies of Granular Velocities. I: Granular Doppler Shifts
and Convective Motion
Authors: Mattig, W.; Mehltretter, J. P.; Nesis, A.
1969SoPh...10..254M Altcode:
The two available methods for determining the rms amplitude of the
granular convective velocity field, namely the interpretation of line
profiles, and direct measurements of velocity fluctuations in highly
resolved spectra, give values (∼ 2 km/sec, and ∼ 0.4 km/sec,
resp.) which are apparently inconsistent both in magnitude and
in their dependence upon optical depth. We give both theoretical
and observational evidence for the working hypothesis, that the
best resolved spectra mainly show velocity fluctuations due to the
oscillation of the solar atmosphere, whereas the contribution of the
granular velocity field is greatly reduced because of atmospheric seeing
and can be found only as a weak superposition to the oscillatory
velocity field. Realistic assumptions for the typical size of
the granulation (2″.5) and for the `seeing parameter' (1″),
together with a simplified model of the granular velocity field,
lead to correction factors of 30 to 40 between the true and observed
amplitudes of the granular velocities.
---------------------------------------------------------
Title: The Geometrical Height-Scale and the Pressure Equilibrium in
the Sunspot Umbra
Authors: Mattig, W.
1969SoPh....8..291M Altcode:
Spectra of spots very near to the solar limb (limb distance ≈ 8″)
are used to determine the height difference between the levels of
formation of the continuum and the line cores of 60 medium-strong
Fraunhofer lines. For all lines (with Rowland Intensity < 10),
this difference is < 1″ (= 725 km) and well correlated with the
Rowland intensity. The line absorption coefficient is calculated for
some lines with known oscillator strength. This gives a possibility to
deduce a value for the scale height of the umbra, which is found to be
about 100 km, thus being equal to the photospheric scale height. Pure
hydrostatic equilibrium exists, therefore, in the umbra, and vertical
magnetic forces are negligible. Other methods for determining the
scale height are discussed for comparison.
---------------------------------------------------------
Title: On the Center-to-Limb Variation of Sunspot Brightness
Authors: Mattig, W.
1969SoPh....6..413M Altcode:
A preliminary analysis of recent measurements of the brightness
ratio spot-photosphere of various authors leads to the result, that
the limb-darkening of the umbra is considerably less than that of the
photosphere. The small value of the center-to-limb variation implies a
very small temperature gradient, which is, for optical depths τ>0.2,
about one order of magnitude smaller than previously thought (Figure
3). This result would seem to rule out radiative equilibrium in the
deeper layers (τ\S>0.2) of sunspot umbrae.
---------------------------------------------------------
Title: Inhomogene Sonnenmodelle und Geschwindigkeitsfluktuationen
der Granulation
Authors: Mattig, W.; Mehltretter, J. P.
1969MitAG..27..204M Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Sunspot Intensities and their Correction for Scattered Light
Authors: Kneer, F.; Mattig, W.
1968SoPh....5...42K Altcode:
Photoelectric measurements of monochromatic spot intensities obtained
with the domeless Coudé refractor in Anacapri are given. The scattered
light superimposed on the spot, as deduced from measurements outside
the sun's limb, amounts on the average to about 4% of the photospheric
intensity. The accuracy of the derived spot intensities is better than
10%. Two of four investigated spots yielded temperatures below 3900K
(ΔΘ > 0.5).
---------------------------------------------------------
Title: Fine Structure of Brightness, Velocity and Magnetic Field in
the Penumbra
Authors: Mattig, W.; Mehltretter, J. P.
1968IAUS...35..187M Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Über den Einfluβ der Bildunruhe auf die
Intensitätsverteilung in Sonnenflecken. Mit 4 Textabbildungen
Authors: Birkle, K.; Mattig, W.
1965ZA.....60..264B Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Is There Radiative Equilibrium in Sunspots?.
Authors: Mattig, W.; Schröter, E. H.
1964ApJ...140..804M Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Line formation in sunspots
Authors: Mattig, W.
1964susp.conf..194M Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Über die Chromosphäre der Sonnenflecken. Mit 9
Textabbildungen
Authors: Mattig, W.
1963ZA.....56..161M Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Zur physikalischen Struktur der Sonnenflecken
Authors: Mattig, W.
1961MitAG..14...47M Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Die Mitte-Rand-Variation des Kontinuums für λbar =
5893 Å und der Flügel der NaD-Linien im Sonnenspektrum. Mit 13
Textabbildungen
Authors: Mattig, W.; Schröter, E. H.
1961ZA.....52..195M Altcode:
No abstract at ADS
---------------------------------------------------------
Title: A comparison between observed and theoretical intensity
distribution in the wings of the NaD-lines
Authors: Mattig, W.; Schörter, E. H.
1960AnAp...23..911M Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Intensity measurements in the wings of the NaD-lines
Authors: Mattig, W.; Schröter, E. H.
1960AnAp...23..913M Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Über den Zusammenhang zwischen der Anzahl der
extragalaktischen Objekte und der scheinbaren Helligkeit
Authors: Mattig, W.
1959AN....285....1M Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Über den Zusammenhang zwischen Rotverschiebung und scheinbarer
Helligkeit
Authors: Mattig, W.
1958AN....284..109M Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Zur Linienabsorption im inhomogenen Magnetfeld der
Sonnenflecken. Mit 8 Textabbildungen
Authors: Mattig, W.
1958ZA.....44..280M Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Polaritäten und Maximalwerte magnetischer Feldstärken von
Sonnenflecken im Zeitraum 1957 Januar I bis März 31
Authors: Künzel, H.; Mattig, W.; Schröter, E. H.
1957AN....284...33K Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Polaritäten und Maximalwerte magnetischer Feldstärken von
Sonnenflecken im Zeitraum 1956 Juli I bis August 31
Authors: Künzel, H.; Mattig, W.; Schröter, E. H.
1957AN....283..251K Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Polaritäten und Maximalwerte magnetischer Feldstärken von
Sonnenflecken im Zeitraum 1956 September I bis Dezember 31
Authors: Künzel, H.; Mattig, W.; Schröter, E. H.
1957AN....283..263K Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Polaritäten und Maximalwerte magnetischer Feldstärken von
Sonnenflecken im Zeitraum 1956 April I bis Juni 30
Authors: Künzel, H.; Mattig, W.; Schröter, E. H.
1956AN....283..159K Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Polaritäten und Maximalwerte magnetischer Feldstärken von
Sonnenflecken in dem Zeitraum 1956 Januar I-März 31
Authors: Künzel, H.; Mattig, W.; Schröter, E. H.
1956AN....283...89K Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Polaritäten und Maximalwerte magnetischer Feldstärken von
Sonnenflecken in den Jahren 1954-1955
Authors: Künzel, H.; Mattig, W.; Schröter, E. H.
1956AN....283...28K Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Die radiale Verteilung der magnetischen Feldstärke in normalen
Sonnenflecken. Mit 2 Textabbildungen
Authors: Mattig, W.
1953ZA.....31..273M Altcode:
No abstract at ADS
