Author name code: mattig ADS astronomy entries on 2022-09-14 author:"Mattig, Wolfgang" ------------------------------------------------------------------------ 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. Bibcode: 2007JAHH...10...73M Altcode: No abstract at ADS Title: Mercury Transit for Stray Light Evaluation: IPM-THEMIS Case Authors: Briand, C.; Mattig, W.; Ceppatelli, G.; Mainella, G. Bibcode: 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. Title: The first decades of JOSO - the Joint Organization for Solar Observations Authors: Brandt, Peter N.; Mattig, Wolfgang Bibcode: 2005dsr..conf..240B Altcode: No abstract at ADS Title: The first decades of JOSO -- the Joint Organization for Solar Observations Authors: Brandt, Peter N.; Mattig, Wolfgang Bibcode: 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. Title: JOSO - the Protagonist for a closer cooperation in Europe - some historical remarks Authors: Mattig, W. Bibcode: 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. Title: Obituary: Anton Bruzek (1915-2003) Authors: Mattig, Wolfgang Bibcode: 2003SoPh..216....1M Altcode: 2003SoPh..216....1. No abstract at ADS Title: The History of the Joint Organization for Solar Observations (JOSO) 1969-2000 Authors: Brandt, P. N.; Mattig, W. Bibcode: 2003ANS...324...94B Altcode: 2003ANS...324..K09B No abstract at ADS Title: Merkur vor der Sonne. Eine Fisternis der besonderen Art Authors: Mattig, Wolfgang; Soltau, Dirk Bibcode: 2003S&W....42d..66M Altcode: No abstract at ADS Title: The history of the Joint Organization for Solar Observation (JOSO) 1969 - 2000 Authors: Brandt, Peter N.; Mattig, Wolfgang Bibcode: 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. Title: H. Haupt and JOSO Authors: Mattig, W. Bibcode: 2001HvaOB..25....1M Altcode: No abstract at ADS Title: Convective overshooting on the Sun: radiative effects Authors: Kiefer, M.; Grabowski, U.; Mattig, W.; Stix, M. Bibcode: 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. Title: Walter Grotrians fundamentale Beiträge zur Physik der Sonnenkorona. Authors: Mattig, W. Bibcode: 1999S&W....38..557M Altcode: No abstract at ADS Title: Geschichte der Sonnenforschung. Authors: Mattig, W. Bibcode: 1999S&WSp...4...86M Altcode: No abstract at ADS Title: Sonnenfinsternisse und die Lichtablenkung. Authors: Mattig, W. Bibcode: 1998S&W....37.1045M Altcode: No abstract at ADS Title: Velocity and intensity oscillations in sunspot penumbrae. Authors: Sigwarth, M.; Mattig, W. Bibcode: 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). Title: Hans-Heinrich Voigt und die Göttinger Sonnenphysik. Authors: Mattig, W. Bibcode: 1996S&W....35..818M Altcode: No abstract at ADS Title: Temperature and velocity fluctuations in the deeper layers of the solar atmosphere. Authors: Vollmoeller, P.; Komm, R.; Mattig, W. Bibcode: 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. Title: Die Sonne Authors: Mattig, W. Bibcode: 1996AN....317...18M Altcode: No abstract at ADS Title: Book Review: Die Sonne, C.H. Beck Verlag, 1995, 125p., ISBN 978-3-406-39001-2 Authors: Posch, Thomas; Mattig, Wolfgang Bibcode: 1995Stern..71..306P Altcode: No abstract at ADS Title: Oscillations above sunspot umbrae. Authors: Kentischer, T. J.; Mattig, W. Bibcode: 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. Title: Von der Rotverschiebung zum solaren Magnetfeld. Authors: Mattig, W. Bibcode: 1995Stern..71..127M Altcode: No abstract at ADS Title: 25 Jahre JOSO - Joint Organization for Solar Observations. Authors: Mattig, W. Bibcode: 1995Stern..71...63M Altcode: No abstract at ADS Title: Dynamics of the solar granulation: bisector analysis Authors: Hanslmeier, A.; Nesis, A.; Mattig, W. Bibcode: 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. Title: Spatial and height changes of oscillations in a sunspot penumbra Authors: Marco, E.; Mattig, W. Bibcode: 1994smf..conf..257M Altcode: No abstract at ADS Title: Dynamics of the solar granulation. Authors: Nesis, A.; Hanslmeier, A.; Hammer, R.; Komm, R.; Mattig, W.; Staiger, J. Bibcode: 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. Title: Oscillations in sunspots near the solar limb and the influence of seeing effects Authors: Federspiel, M.; Mattig, W. Bibcode: 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.

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. Title: Goals of ground-based solar observations. Authors: Mattig, W. Bibcode: 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. Title: Dynamics of the solar granulation - Coherence of line parameters and their variation with the height Authors: Hanslmeier, A.; Nesis, A.; Mattig, W. Bibcode: 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. Title: Rapid Variations in the Intergranular Space Authors: Nesis, A.; Hanslmeier, A.; Hammer, R.; Komm, R.; Mattig, W.; Staiger, J. Bibcode: 1993ASPC...46..222N Altcode: 1993mvfs.conf..222N; 1993IAUCo.141..222N No abstract at ADS Title: Coherence Analysis of Photospheric Line Parameters in Active and Non-Active Solar Regions Authors: Hanslmeier, A.; Mattig, W.; Nesis, A. Bibcode: 1993ASPC...46...36H Altcode: 1993IAUCo.141...36H; 1993mvfs.conf...36H No abstract at ADS Title: Ergebnisse und Probleme der Sonnenforschung. Authors: Mattig, W. Bibcode: 1992AsSch..29R...6M Altcode: No abstract at ADS Title: What are the Boundaries of Solar Granules? Authors: Nesis, A.; Hanslmeier, A.; Hammer, R.; Komm, R.; Mattig, W.; Staiger, J. Bibcode: 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. Title: Book Review: Opening the frontiers in solar research / Pergamon, 1991 Authors: Machado, M. E.; Mattig, W.; Simon, G. W.; Harrison, R. A. Bibcode: 1992Obs...112...70F Altcode: No abstract at ADS Title: Velocity Fluctuations; Energy Dissipation in the Solar Photosphere Authors: Komm, R.; Mattig, W.; Nesis, A. Bibcode: 1992ASPC...26..175K Altcode: 1992csss....7..175K No abstract at ADS Title: Dynamics of the solar granulation. I - A phenomenological approach Authors: Nesis, A.; Hanslmeier, A.; Hammer, R.; Komm, R.; Mattig, W.; Staiger, J. Bibcode: 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. Title: Bisector; Line Parameter Variation Over a Single Solar Granulum Authors: Hanslmeier, A.; Mattig, W.; Nesis, A. Bibcode: 1992ASPC...26..168H Altcode: 1992csss....7..168H No abstract at ADS Title: The decay of granular motions and the generation of gravity waves in the solar photosphere Authors: Komm, R.; Mattig, W.; Nesis, A. Bibcode: 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. Title: The height dependence of velocity-intensity fluctuations and several non-dimensional parameters in the solar photosphere Authors: Komm, R.; Mattig, W.; Nesis, A. Bibcode: 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. Title: The variation of the solar granulation structure in active and non-active regions Authors: Hanslmeier, A.; Nesis, A.; Mattig, W. Bibcode: 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. Title: Selected examples of bisector and line parameter variation over a granular-intergranular region Authors: Hanslmeier, A.; Mattig, W.; Nesis, A. Bibcode: 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. Title: Granular and intergranular line profiles in solar active and quiet regions Authors: Hanslmeier, A.; Mattig, W.; Nesis, A. Bibcode: 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. Title: High spatial resolution solar photospheric line observations in Ca(+) active regions Authors: Hanslmeier, A.; Mattig, W.; Nesis, A. Bibcode: 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. Title: Granulation Spectroscopy: First Results from VTT-Tenerife Authors: Nesis, A.; Hanslmeier, A.; Hammer, R.; Komm, R.; Mattig, W.; Staiger, J. Bibcode: 1991BAAS...23R1048N Altcode: No abstract at ADS Title: The small-scale velocity field in the solar photosphere Authors: Komm, R.; Mattig, W.; Nesis, A. Bibcode: 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. Title: High resolution line profiles in quiet and plage regions of the sun Authors: Guenther, E.; Mattig, W. Bibcode: 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. Title: Turbulence, fractals, and the solar granulation. Authors: Brandt, P. N.; Greimel, R.; Guenther, E.; Mattig, W. Bibcode: 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+ active and non active regions Authors: Hanslmeier, A.; Mattig, W. Bibcode: 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. Bibcode: 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. Bibcode: 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. Bibcode: 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. Bibcode: 1991mcch.conf...36N Altcode: No abstract at ADS Title: Samples of recent high resolution solar observations at Tenerife Authors: Wiehr, E.; Mattig, W. Bibcode: 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. Bibcode: 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. Bibcode: 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. Bibcode: 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. Bibcode: 1990SoPh..129..199K Altcode: 1990SoPh..129..199C No abstract at ADS Title: Penumbral oscillations in Na D lines Authors: Marco, E.; Mattig, W. Bibcode: 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 rms. 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+-active regions Authors: Hanslmeier, A.; Mattig, W. Bibcode: 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. Bibcode: 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. Bibcode: 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. Bibcode: 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 Bibcode: 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. Bibcode: 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. Bibcode: 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. Bibcode: 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. Bibcode: 1990AGAb....5....7G Altcode: No abstract at ADS Title: Influence of Magnetic Fields on Temperature Inhomogeneities Authors: Hanslmeier, A.; Mattig, W. Bibcode: 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. Bibcode: 1990AGAb....5....8F Altcode: No abstract at ADS Title: On the line asymmetry distribution in solar Ca+ active and non active regions. Authors: Hanslmeier, A.; Mattig, W. Bibcode: 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. Bibcode: 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. Bibcode: 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. Bibcode: 1989hsrs.conf..314H Altcode: No abstract at ADS Title: Results on the height dependence of granular velocity fluctuations Authors: Komm, R.; Mattig, W. Bibcode: 1989hsrs.conf..330K Altcode: No abstract at ADS Title: Granulation Line Asymmetries Authors: Mattig, W.; Hanslmeier, A.; Nesis, A. Bibcode: 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. Bibcode: 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. Bibcode: 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. Bibcode: 1989AGAb....3....7H Altcode: No abstract at ADS Title: Oscillations in sunspots near the solar limb. Authors: Mattig, W.; Zerfass, M. Bibcode: 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. Bibcode: 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. Bibcode: 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. Bibcode: 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. Bibcode: 1987pwoa.book.....M Altcode: No abstract at ADS Title: Joint Discussion on Topics of Sessions 3 and 4 Authors: Stenflo, J. O.; Mattig, W. Bibcode: 1987rfsm.conf..116S Altcode: No abstract at ADS Title: Granulare Overshoot-Schichten als Randbedingungen Authors: Nesis, A.; Komm, R.; Mattig, W. Bibcode: 1986MitAG..67..289N Altcode: No abstract at ADS Title: Einiges zur Streulichtkorrektur Authors: Komm, R.; Hessenbruch, A.; Mattig, W. Bibcode: 1986MitAG..67..286K Altcode: No abstract at ADS Title: The LEST-Project Authors: Mattig, W. Bibcode: 1986MitAG..67..258M Altcode: No abstract at ADS Title: Tagung zur Vorbereitung des ersten SOT(Solar Optical Telescope)-Fluges in München. Authors: Mattig, W. Bibcode: 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. Bibcode: 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. Bibcode: 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. Bibcode: 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. Bibcode: 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. Bibcode: 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. Bibcode: 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. Bibcode: 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. Bibcode: 1984S&W....23...64M Altcode: No abstract at ADS Title: On the instrumental and atmospheric stray-light for solar observations. Authors: Mattig, W. Bibcode: 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 10−5 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. Bibcode: 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 D1 and D2, 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. Bibcode: 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. Bibcode: 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. Bibcode: 1983MitAG..60..279N Altcode: No abstract at ADS Title: Johannes Peter Mehltretter. Authors: Mattig, W. Bibcode: 1983MitAG..59....9M Altcode: No abstract at ADS Title: Zur Struktur der Chromosphäre über Sonnenflecken Authors: Kneer, F.; Mattig, W.; von Uexküll, M. Bibcode: 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. Bibcode: 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. Bibcode: 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. Bibcode: 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. Bibcode: 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.

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.

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. Bibcode: 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. Bibcode: 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 × 1010 cm-3 ≲ne* ≲2.3 × 1011 cm-3 at 20 000 K is estimated. Title: Sonnenfleckenchromosphären und der Wilson-Bappu-Effekt Authors: Mattig, W. Bibcode: 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. Bibcode: 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. Bibcode: 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. Bibcode: 1980SoPh...68...31K Altcode: A high resolution spectrogram of the Mg b2 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 τ5000 > 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. Bibcode: 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. Bibcode: 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. Bibcode: 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. Bibcode: 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. Bibcode: 1979MitAG..45..149D Altcode: No abstract at ADS Title: Project Spectrostratoscope: Balloon-borne solar research Authors: Mehltretter, J. P.; Mattig, W.; Vonalvensleben, A. Bibcode: 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. Bibcode: 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. Bibcode: 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. Bibcode: 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. Bibcode: 1978MitAG..43..141K Altcode: No abstract at ADS Title: Das geplante Sonnenobservatorium auf den Kanarischen Inseln Authors: Mattig, W. Bibcode: 1978MitAG..43...32M Altcode: No abstract at ADS Title: Korrektur von gemessenen granularen Geschwindigkeiten aus Sonnenfinsternisbeobachtungen Authors: Mattig, W.; Nesis, A.; Reiss, G. Bibcode: 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. Bibcode: 1977MitAG..41...81M Altcode: No abstract at ADS Title: Studies of granular velocities. VII: Granular velocities around sunspots. Authors: Mattig, W.; Nesis, A. Bibcode: 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. Bibcode: 1976MitAG..40Q.162M Altcode: No abstract at ADS Title: Fraunhofer-Institut mit den Observatorien Schauinsland und Anacapri. Report 1975. Authors: Mattig, W. Bibcode: 1976MitAG..39...68M Altcode: No abstract at ADS Title: Makroskopische Geschwindigkeiten in der unmittelbaren Umgebung von Sonnenflecken. Authors: Mattig, W.; Nesis, A. Bibcode: 1976MitAG..38..217M Altcode: No abstract at ADS Title: Nachrufe : Karl-Otto Kiepenheuer Authors: Mattig, W. Bibcode: 1976MitAG..38...11M Altcode: No abstract at ADS Title: New observations of the granular intensity fluctuations. Authors: Deubner, F. L.; Mattig, W. Bibcode: 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. Bibcode: 1975MitAG..36..148D Altcode: No abstract at ADS Title: Granulare Geschwindigkeiten in der Nähe von Sonnenflecken Authors: Mattig, W.; Nesis, A. Bibcode: 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. Bibcode: 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. Bibcode: 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. Bibcode: 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−1 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. Bibcode: 1974SoPh...34..299M Altcode: No abstract at ADS Title: Das Sonnenobservatorium auf dem Schauinsland. Authors: Mattig, W. Bibcode: 1974S&W....13..259M Altcode: No abstract at ADS Title: The Quiet Sun Authors: Mattig, W. Bibcode: 1973lsp2.conf....7M Altcode: No abstract at ADS Title: Solar Magnetic Field Observations Authors: Mattig, W. Bibcode: 1973lsp2.conf...25M Altcode: No abstract at ADS Title: Astronomische Beobachtungen und kosmologische Modelle. Authors: Mattig, W. Bibcode: 1973coco.conf..169M Altcode: No abstract at ADS Title: Statistische Analyse granularer Dopplerverschiebungen Authors: Mattig, W.; Nesis, A. Bibcode: 1973MitAG..34..114M Altcode: No abstract at ADS Title: Granulare Geschwindigkeiten in der Sonnenatmosphäre Authors: Nesis, A.; Mattig, W. Bibcode: 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. Bibcode: 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. Bibcode: 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⊙ and aureole intensities <0.01 I⊙. The stray light correction to the spot intensities has been <(0.03 ± 0.01) I⊙. 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⊙ + + 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. Bibcode: 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. Bibcode: 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. Bibcode: 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. Bibcode: 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. Bibcode: 1969MitAG..27..204M Altcode: No abstract at ADS Title: Sunspot Intensities and their Correction for Scattered Light Authors: Kneer, F.; Mattig, W. Bibcode: 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. Bibcode: 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. Bibcode: 1965ZA.....60..264B Altcode: No abstract at ADS Title: Is There Radiative Equilibrium in Sunspots?. Authors: Mattig, W.; Schröter, E. H. Bibcode: 1964ApJ...140..804M Altcode: No abstract at ADS Title: Line formation in sunspots Authors: Mattig, W. Bibcode: 1964susp.conf..194M Altcode: No abstract at ADS Title: Über die Chromosphäre der Sonnenflecken. Mit 9 Textabbildungen Authors: Mattig, W. Bibcode: 1963ZA.....56..161M Altcode: No abstract at ADS Title: Zur physikalischen Struktur der Sonnenflecken Authors: Mattig, W. Bibcode: 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. Bibcode: 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. Bibcode: 1960AnAp...23..911M Altcode: No abstract at ADS Title: Intensity measurements in the wings of the NaD-lines Authors: Mattig, W.; Schröter, E. H. Bibcode: 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. Bibcode: 1959AN....285....1M Altcode: No abstract at ADS Title: Über den Zusammenhang zwischen Rotverschiebung und scheinbarer Helligkeit Authors: Mattig, W. Bibcode: 1958AN....284..109M Altcode: No abstract at ADS Title: Zur Linienabsorption im inhomogenen Magnetfeld der Sonnenflecken. Mit 8 Textabbildungen Authors: Mattig, W. Bibcode: 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. Bibcode: 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. Bibcode: 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. Bibcode: 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. Bibcode: 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. Bibcode: 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. Bibcode: 1956AN....283...28K Altcode: No abstract at ADS Title: Die radiale Verteilung der magnetischen Feldstärke in normalen Sonnenflecken. Mit 2 Textabbildungen Authors: Mattig, W. Bibcode: 1953ZA.....31..273M Altcode: No abstract at ADS