explanation blue bibcodes open ADS page with paths to full text
Author name code: gurtovenko
ADS astronomy entries on 2022-09-14
author:"Gurtovenko, Ernest Andreivich"
---------------------------------------------------------
Title: Formation depths of Fraunhofer lines
Authors: Gurtovenko, E. A.; Sheminova, V. A.
2015arXiv150500975G Altcode:
We have summed up our investigations performed in 1970--1993. The
main task of this paper is clearly to show processes of formation
of spectral lines as well as their distinction by validity and by
location. For 503 photospheric lines of various chemical elements
in the wavelength range 300--1000 nm we list in Table the average
formation depths of the line depression and the line emission for the
line centre and on the half-width of the line, the average formation
depths of the continuum emission as well as the effective widths of the
layer of the line depression formation. Dependence of average depths of
line depression formation on excitation potential, equivalent widths,
and central line depth are demonstrated by iron lines.
---------------------------------------------------------
Title: Formation depth of Fraunhofer lines
Authors: Gurtovenko, E. A.; Sheminova, V. A.
1997MAO.....1P...3G Altcode:
We have summed up our investigations performed in 1970-1993 which
were devoted to the problem of the effective depths of spectral
absorption line formation. The main purpose of this paper is to show
the difference in the effectiveness of the various physical processes
responsible for the line absorption formation as well as to present
Tables of line formation depths. The 503 photospheric lines of various
chemical elements in the wavelength range 300-1000 nm were used for
our calculations. We list in the Tables the formation depths of both
depression and emission in line center and line half-width as well
as the average formation depths of the continuum emission for the
corresponding wavelengths. Additionally in the Tables, we give the
effective widths of the formation region of each absorption line. The
change of the average formation depths of iron lines in dependence on
excitation potential, equivalent widths, and central line intensity
are demonstrated on Figures.
---------------------------------------------------------
Title: A Big Horizontal Solar Telescope of the Main Astronomical
Observatory of the Ukrainian National Academy of Sciences in the
caucasus
Authors: Burlov-Vasil'Ev, K. A.; Vasil'Eva, I. E.; Gurtovenko, E. A.;
Matveev, Yu. B.
1996R&QE...39..887B Altcode:
This paper presents the Big Horizonal Solar Telescope of the Main
Astronomical Observatory of the Ukrainian National Academy of Sciences
installed at the “Peak Terskol” high-altitude station near Elbrus
(the main mirror diameter is 650 mm and the focal length is 17.5
m). The telescope is equipped with a five-camera spectrograph intended
for photographic spectral observations of active regions in the solar
atmosphere and photoelectric measurements of the solar spectra with
high spectral and spatial resolution. The observation procedure is
described, and the results of the quality analysis of the recorded
spectra and of the early measurements are presented.
---------------------------------------------------------
Title: New absolute measurements of the solar spectrum 310 685 nm
Authors: Burlov-Vasiljev, K. A.; Gurtovenko, E. A.; Matvejev, Yu. B.
1995SoPh..157...51B Altcode:
During 1986-1989 at the high-altitude station on the Peak Terskol,
Caucasus (h = 3000 m) absolute measurements of the solar disk-centre
intensity were performed. The observations were carried out with the
specialized solar telescope (D = 23 cm,F = 3 m) and grating spectrometer
(F = 2 m, grating 140 × 150 mm, 600 grooves mm<SUP>−1</SUP>). The
ribbon tungsten lamps used for absolute calibration were calibrated
to the USSR standard of spectral intensity and were also compared with
the irradiance standard of the PMO/WRC (Davos, Switzerland), with the
lamps used in the Alma-Ata Observatory (Kazakhstan) and in Simferopol
University for absolute measurements of stellar spectra. Methods
and apparatus were improving step by step during 1985-1988. Special
care was paid to the study of all possible sources of errors, in
particular to the method of correction for atmospheric extinction, to
polarization properties of optical elements of the apparatus, and to
establishing the most reliable absolute calibration system. Finally,
the observations performed during 1989 utilized only the refined
methods and apparatus. As a result, the absolute integrals of the
solar disk-centre intensity for 1-nm wide spectral bands in the
range 310-685 nm are available. We estimate the total error is 2.5%
at 310 nm and 2.1% at 680 nm. The absolute irradiance for 5-nm wide
spectral bands is also obtained. We compare our results with results
by Neckel and Labs (1984), with the irradiance filter measurements
performed in PMO/WRC and calibration of the Sun's spectral irradiance
to the stellar irradiance standard Vega by Lockwood (1992). Our
results show a systematic difference with data by Neckel and Labs
in the near-ultraviolet. The results by Neckel and Labs are probably
underestimated in this spectral range by 8%.
---------------------------------------------------------
Title: Photometer “difos” for the study of solar brightness
variations
Authors: Gurtovenko, E. A.; Kesel'Man, I. G.; Kostyk, R. I.; Osipov,
S. N.; Lebedev, N. I.; Kopayev, I. M.; Orajevsky, V. N.; Zhugzhda,
Yu. D.
1994SoPh..152...43G Altcode: 1994svs..coll...43G; 1994IAUCo.143...43G
A photometer has been designed for measuring solar irradiance within
three wide spectral bands with a relative error 0.00001 and time
resolution of 16 sec. It is elaborated according to the international
space project KORONAS and is planned to be launched at the begining
of 1994. A description of its layout and operation is given briefly.
---------------------------------------------------------
Title: The Solar Radiation Between 310-680 nm
Authors: Burlov-Vasiljev, K. A.; Gurtovenko, E. A.; Matvejev, Yu. B.
1992sers.conf...49B Altcode:
No abstract at ADS
---------------------------------------------------------
Title: What is the difference between `emission' and `depression'
contribution functions?
Authors: Gurtovenko, E. A.; Sheminova, V. A.; Sarychev, A. P.
1991SoPh..136..239G Altcode:
The right approach to the problem of the depth of Fraunhofer line
formation enables us to distinguish the main processes involved in
the formation of a Fraunhofer line and to locate the depths for these
processes in the photosphere.
---------------------------------------------------------
Title: Observation of Solar Eclipse in Mexico 1991JUL11 for Solar
Diameter Determination
Authors: Gurtovenko, E. A.; Telnyuk-Adamchuk, V. V.; Okulov, S. M.;
Buzdugan, J. P.; Olijnyk, P. O.
1991ATsir1550...29G Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Absolute spectrophotometry of the Sun. I. The formulation of
the problem and method of solution.
Authors: Burlov-Vasil'Ev, K. A.; Gurtovenko, E. A.; Matveev, Iu. B.;
Troian, V. I.
1990KFNT....6...33B Altcode: 1990KNFT....6...33B
A brief review of the problem of absolute solar spectrophotometry
is given. The necessity of fulfilment of a new set of measurements,
calibrated by the USSR standard of the spectral density of the
energy brightness is substantiated. The demands to the equipment are
formulated. The error sources are discussed and the analysis of their
reduction is given. The method of the measurements is motivated.
---------------------------------------------------------
Title: Solar Oscillator Strengths as a Diagnostic Tool
Authors: Gurtovenko, E. A.; Kostik, R. I.; Rutten, R. J.
1990IAUS..138...35G Altcode:
No abstract at ADS
---------------------------------------------------------
Title: New solar oscillator strengths from Kiev
Authors: Gurtovenko, E. A.; Kostik, R. I.; Rutten, R. J.
1990asos.conf...92G Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Fraunhofer spectrum and a system of solar oscillator strengths
Authors: Gurtovenko, Ernest A.; Kostyk, Roman I.
1989KiIND.........G Altcode:
Results of research concerned with the Fraunhofer spectrum of the sun
and problems associated with this type of research are reviewed in
a historical perspective. Solar dual-diffraction monochromators are
described, and methods of observing the Fraunhofer spectrum with a
high spectral resolution are discussed. Results of studies concerned
with the development of solar oscillator forces, determined from the
Fraunhofer lines, are reviewed. Oscillator force values are presented
for 1958 spectral lines of 49 chemical elements in the wavelength
range 303-996 nm.
---------------------------------------------------------
Title: The solution of the transfer equation for absorption and the
depth of Fraunhofer-line formation
Authors: Gurtovenko, E. A.; Sarychev, A. P.
1988AZh....65..653G Altcode:
It is proved that the contribution function obtained previously as
a result of solution of the transfer equation for depression, is
identically equal to the contribution function of Unsöld-Pecker.
---------------------------------------------------------
Title: On the possibility to improve the homogeneous photospheric
model of the Sun.
Authors: Gurtovenko, E. A.; Sheminova, V. A.
1988KFNT....4...18G Altcode:
Modelling of differences of solar oscillator strengths derived from
equivalent widths and central intensities with variations of nominal
temperature of the photospheric model and characteristics of the
photospheric velocity field has been made. The accuracy of determining
chemical element abundances is evaluated by applying the specific
uncertainties of the distribution of temperature and velocity field
amplitude in the solar photosphere. The investigations of temperature
and luminosity variations of the Sun from precise observations of
Fraunhofer lines may bring fruitful results. The line symmetry of light
elements with high excitation potential may serve as a "sensitive"
indicator of physical inhomogeneity of solar and stellar atmospheres.
---------------------------------------------------------
Title: Solution of the Transfer Equation for Absorption and the
Depth of Formation of Fraunhofer Lines
Authors: Gurtovenko, E. A.; Sarychev, A. P.
1988SvA....32..337G Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Crossing Method for Studying the Turbulence in Solar and
Stellar Atmospheres - Part One - Application to the Sun
Authors: Gurtovenko, E. A.; Sheminova, V. A.
1986SoPh..106..237G Altcode:
A new `crossing' method for the study of turbulent velocities
in solar and stellar photospheres is considered. The method does
not need knowledge of the abundance and oscillator strengths for
determining the microturbulent velocity, if the macroturbulent
velocity is adopted; or it allows investigation of the micro- and
macro-velocities simultaneously, if the abundance and oscillator
strengths are known. Using the crossing method for 200 lines of neutral
iron we obtain microturbulent velocities for a large range of depths in
the solar photosphere. The distribution of macroturbulent velocities
with depth is also investigated. The total velocity field calculated
from the obtained micro- and macro-velocities agrees with previous
results from independent methods. This demonstrates the reliability
of using the crossing method for separate determination of the micro-
and macroturbulent velocities in solar and stellar atmospheres.
---------------------------------------------------------
Title: Integral spectrum of the sun as a star in UV (0.1 - 0.32 μm)
and IR (1 - 50 μm) regions.
Authors: Burlov-Vasilev, K. A.; Gurtovenko, E. A.; Troian, V. I.
1986KFNT....2....3B Altcode:
The measurements of the spectral energy distribution of the sun as a
star in ultraviolet and infrared are reviewed. The standard distribution
in UV is deduced from an analysis of the most important 11 series of
independent observations of the 20th and 21st cycles. This distribution
is shown to differ from the widely used Makarova and Kharitonov's set
in UV, while for the IR region the set by Makarova and Kharitonov is
at present the most reliable one.
---------------------------------------------------------
Title: Scattered light in a spectrograph and its effect on the
measured darkening to the solar limb.
Authors: Gurtovenko, E. A.; Osipov, S. N.
1986KFNT....2...59G Altcode:
The procedure of corrections of observed solar limb darkening for
the influence of spectrograph scattered light is presented. The
measurements of scattered light in the first order of diffraction
carried out by three different methods agree well. With the chosen
filters the corrections are shown to be insignificant for most of the
region of the spectrum.
---------------------------------------------------------
Title: Book reviews
Authors: Gurtovenko, E. A.; Kostik, R. I.; Tlamicha, A.; Zerull, R.;
Schadee, Aert; Mészáros, A.; Néeman, Y.; Giese, R. H.; Sinclair,
A. T.; Kleczek, J.; Trendelenburg, E. A.; Hillebrandt, Wolfgang;
Sehnal, L.; de Graaff, W.; Slottje, C.; Courvisier, T.; van Beek,
H. F.; Baud, B.; de Jager, C.; Danby, J. M. A.; Somov, B. V.;
Cassinelli, J.; Verbunt, F.
1986SSRv...44..177G Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Book-Review - Spectral Line Shapes
Authors: Rostas, F.; Gurtovenko, E. A.; Kostik, R. I.
1986SSRv...44..177R Altcode:
No abstract at ADS
---------------------------------------------------------
Title: The establishment of internally consistent solar scales of
oscillatorstrengths and abundances of chemical elements. Zirconium.
Authors: Gurtovenko, E. A.; Kostyk, R. I.; Orlova, T. V.
1986KFNT....2...20G Altcode:
Oscillator strengths for 19 Zr I lines (r.m.s. error±0.078 dex) and
10 Zr II lines (±0.081 dex) are determined from observed equivalent
widths and central depths of solar Fraunhofer lines. The analysis of
the differences of oscillator strengths derived from equivalent widths
and from central depths leads to the conclusion that the lines under
study have no essential hyperfine structure.
---------------------------------------------------------
Title: On the difference in the depths of formation of the centers
of weak Fraunhofer lines and the far wings of strong ones
Authors: Gurtovenko, E. A.; Sheminova, V. A.
1985AZh....62..988G Altcode:
The Voigt function H(a,v) influences the absorption coefficient of the
centre and of the wing of a Fraunhofer line differently. The absorption
coefficient of the line centre is K(0) ≡ N/Δλ<SUB>D</SUB>, and
the one of the far wings is K(v) ≡ Nγ. Here N is the concentration
of absorbing atoms, Δλ<SUB>D</SUB> is the Doppler width, γ is the
damping-broadening constant, sharply increasing downward into the
photosphere. Due to this, the effective depths of formation of far
wings of strong lines are larger than those of weak lines having the
same atomic parameters.
---------------------------------------------------------
Title: On the difference in the depths of formation of the centers
of weak Fraunhofer lines and the far wings of strong ones
Authors: Gurtovenko, É. A.; Sheminova, V. A.
1985SvA....29..578G Altcode:
No abstract at ADS
---------------------------------------------------------
Title: On the Difference in the Depths of Formation of the Centers
of Weak Fraunhofer Lines and the Far Wings of Strong Ones
Authors: Gurtovenko, E. A.; Sheminova, V. A.
1985SvA....29..572G Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Oscillator strengths for the lines of the iron group elements.
Authors: Gurtovenko, E. A.; Kostyk, R. I.; Orlova, T. V.
1985KFNT....1....3G Altcode:
The significance of the work on the establishment of the solar gf-scales
for the Fraunhofer lines of the elements of the iron group is evaluated
in general, and the results of the work are summed up. The information
on the number of lines investigated is given as well as on the number
of corresponding publications. The comparison of the solar gf-scales
with the highest precision values of the oscillator strengths for
selected lines obtained in Oxford gives the r.m.s. internal error of
the solar gf-scales ≤0.07 dex.
---------------------------------------------------------
Title: On the establishment of internally consistent solar scales of
oscillator strengths and abundances of chemical elements. VI. Neutral
vanadium.
Authors: Gurtovenko, E. A.; Kostyk, R. I.; Orlova, T. V.
1985KFNT....1...62G Altcode:
Oscillator strengths of 55 lines of neutral vanadium are determined
from equivalent widths of solar Fraunhofer lines using the procedure
developed by the authors and reported in the previous papers.
---------------------------------------------------------
Title: Velocity Field in the Region of the Temperature Minimum of
the Solar Atmosphere - Preliminary Results of a Determination of
the Amplitude of the General Velocity Field
Authors: Gurtovenko, E. A.; Sheminova, V. A.; Rutten, R. J.
1985SvA....29...72G Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Velocity field in the region of the temperature minimum of
the solar atmosphere - Preliminary results of a determination of
the amplitude of the general velocity field
Authors: Gurtovenko, E. A.; Sheminova, V. A.; Rutten, R. J.
1985AZh....62..124G Altcode:
The weak Fraunhofer lines in the near wings of H, K Ca II lines have
been analysed to study the velocity amplitude of the general velocity
field in the middle and outer photospheric layers. The results
confirm the basic well-known data on the velocity amplitude in the
middle photospheric layers. Besides, it is shown that the radial and
tangential components of the velocity amplitude continue to decrease
with height also in the outer photosphere.
---------------------------------------------------------
Title: Establishment of internally consistent solar scales of
oscillator strenghts and abundances of chemical elements. V. Scandium.
Authors: Gurtovenko, E. A.; Kostyk, P. I.; Orlova, T. V.
1985KFNT....1...75G Altcode:
Oscillator strengths for 31 selected Sc I and Sc II lines were
determined using the observed equivalent widths of the Fraunhofer lines.
---------------------------------------------------------
Title: On the Establishment of Internally Consistent Solar Scales
of Oscillator Strengths and Abundances of Chemical Elements - Part
Seven - Mni
Authors: Gurtovenko, E. A.; Kostik, R. I.; Orlova, T. V.
1984BSolD...9...85G Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Depth of formation of Fraunhofer lines
Authors: Gurtovenko, É. A.; Sheminova, V. A.
1983AZh....60..982G Altcode:
A straightforward physical discussion of the processes of formation of
the emergent photospheric radiation and the line depression observed
on the continuum background has been made.
---------------------------------------------------------
Title: Depth of Formation of Fraunhofer Lines
Authors: Gurtovenko, E. A.; Sheminova, V. A.
1983SvA....27..568G Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Construction of Internally Consistent Scales of Solar
Oscillator Strengths and Contents of Chemical Elements - Determination
of Coi Oscillator Strengths from the Equivalent Widths of Fraunhofer
Lines with Allowance for Their Hyperfine Structure
Authors: Gurtovenko, E. A.; Kostyk, R. I.; Orlova, T. V.
1983SvA....27..439G Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Construction of internally consistent scales of solar
oscillator strengths and contents of chemical elements Determination
of CO I oscillator strengths from the equivalent widths of Fraunhofer
lines with allowance for their hyperfine structure
Authors: Gurtovenko, E. A.; Kostik, R. I.; Orlova, T. V.
1983AZh....60..758G Altcode:
The authors use the observed equivalent widths of 50 Co I lines and
cobalt abundance lg A = 4.98 to derive the oscillator strengths (gf)
of these lines. In addition, for 14 lines from the total list the
oscillator strengths (gf<SUB>HFS</SUB>) were obtained with accounting
for their hyperfine structure. Clear dependences of the difference lg
gf - lg gf<SUB>HFS</SUB> on equivalent width and excitation potential
are revealed. Using these dependences, the authors have corrected all
the oscillator strengths obtained without accounting for the hyperfine
structure.
---------------------------------------------------------
Title: Solar physics at the Main Astronomical Observatory of the
Ukrainian Academy of Sciences
Authors: Gurtovenko, E. A.
1982SoPh...80..317G Altcode:
A brief review of the research highlights at the Main Astronomical
Observatory since 1968.
---------------------------------------------------------
Title: The Empirical Determination of Damping Constants in the Solar
Photosphere - Part Two - Results Inferred from the Wings of FEI Lines
Authors: Gurtovenko, E. A.; Fedorchenko, G. L.; Kondrashova, N. N.
1982SoPh...77..291G Altcode:
We determine empirical damping constants for 73 selected Fe I lines
following the method of Gurtovenko and Kondrashova (1980), employing
high-quality observations and the accurate list of Fe I oscillator
strengths by Gurtovenko and Kostik (1980).
---------------------------------------------------------
Title: On the establishment of internally consistent solar scales
of oscillator strengths and abundances of chemical elements. III -
Oscillator strengths obtained from equivalent widths of 360 FeI lines
Authors: Gurtovenko, E. A.; Kostik, R. I.
1982A&AS...47..193G Altcode:
Oscillator strengths for 360 selected Fraunhofer lines were determined
using the observed equivalent widths of those lines. The R.M.S. error
of the gf-values obtained amounts to 0.06-0.07 dex. The comparison
of oscillator strengths calculated from equivalent widths (w) and
central intensity (d) shows the reliability of the methods used and
of the underlaying data. The systematic increase of the difference log
gf<SUB>W</SUB> - log gf<SUB>d</SUB> for strong lines of high excitation
potential is noticeable.
---------------------------------------------------------
Title: Some Photospheric Characteristics of the Sun as a Star
Authors: Gurtovenko, E. A.
1982ASSL...96...99G Altcode: 1982spls.meet...99G
No abstract at ADS
---------------------------------------------------------
Title: On the establishment of internally consistent solar
scales of oscillator strengths and abundances of chemical
elements. I. Oscillator strengths for 865 FeI lines iron abundance.
Authors: Gurtovenko, E. A.; Kostik, R. I.
1981A&AS...46..239G Altcode:
A method is developed for the establishment of internally consistent
scales for solar abundances and oscillator strengths and used to deduce
the solar iron abundance and the oscillator strengths for 865 Fe I
lines. The method involves the calculation of L, defined as the product
of the abundance with the oscillator strength, which can be inferred
from the line profiles, equivalent widths, central intensities and
the entire Fraunhofer spectrum of the specific chemical element. In
the iron study, abundance and oscillator strengths are derived from
unblended central intensities of lines in the region 4000-8000 A taking
into account the influence of macroturbulence velocities. An average
iron abundance of 7.525 + or - 0.007 is obtained from 266 weak and
moderately strong lines appearing in the oscillator strength scale of
May et al. (1974). The obtained abundance was then used to calculate
the oscillation strengths of all 612 weak and moderate Fe I lines and
the remaining strong lines to within + or - 0.035 dex.
---------------------------------------------------------
Title: On the Establishment of Internally Consistent Solar Scales of
Oscillator Strengths and Abundances of Chemical Elements - Part Two -
on the Errors of the Oscillator Strengths of FEI Lines in the Kurucz
Authors: Gurtovenko, E. A.; Kostik, R. I.
1981A&A...101..132G Altcode:
It is shown that the errors on the oscillator strengths of the
Kurucz-Peytremann gf-scale depend in a regular way upon the excitation
potential and gf-value. Oscillator strengths with small values
of gf and large excitation potentials are underestimated, and vice
versa. Especially strong underestimations (by ≍2 orders of magnitude)
of the oscillator strengths take place for the lines with excitation
potentials EPL > 4 eV and oscillator strengths log gf < -4.0.
---------------------------------------------------------
Title: The abundance of titanium in the solar photosphere
Authors: Gurtovenko, E. A.; Fedorchenko, G. L.; Sheminova, V. A.
1981AAfz...43...59G Altcode:
The abundance of titanium in the solar photosphere is determined from
equivalent widths of 38 weak Fraunhofer lines of TiI. The oscillator
strengths scale of Kurucz and Peytremann (1975) is used to obtain
log(NTi/NH), + 12 = 4.95 + or - 0.05. The results are compared to other
recent investigations, from which it is concluded that the oscillator
strength system of Kurucz and Peytremann presents significant systematic
errors, and must therefore be studied in detail, using a large number
of lines for a wide range of equivalent widths.
---------------------------------------------------------
Title: The Empirical Determination of Damping Constants in the Solar
Photosphere - Part One - Preliminary Results for FEI Lines
Authors: Gurtovenko, E. A.; Kondrashova, N. N.
1980SoPh...68...17G Altcode:
The evaluation of damping constants is discussed and the results
of their empirical determination by various authors are listed in
the Appendix.
---------------------------------------------------------
Title: On the Establishment of Internally Consistent
Abundance-Oscillator Strength Scales
Authors: Gurtovenko, E. A.; Kostik, R. I.
1980LNP...114..296G Altcode: 1980IAUCo..51..296G; 1980sttu.coll..296G
No abstract at ADS
---------------------------------------------------------
Title: High-resolution solar spectroscopy with double-pass
monochromators
Authors: Gurtovenko, E. A.
1980AAfz...41...15G Altcode:
The basic characteristics of double-pass monochromators for
high-resolution solar spectroscopy are presented. Consideration is
given to the determining influence of the intermediate slit on the
wings of the apparatus function in the high-resolution registration
of absorption line profiles. The double diffraction technique is
described, and formulas for the apparatus function are presented. The
principal errors of double-pass solar spectrometer are analyzed,
and some suggestions concerning the adjustment of the device are given.
---------------------------------------------------------
Title: Solar Spectrographs
Authors: Gurtovenko, E. A.
1980IGAFS..52...96G Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Determination of the damping constant from wings of strong
Fraunhofer lines of the Liege solar spectrum atlas
Authors: Kondrashova, N. N.; Gurtovenko, E. A.
1980AAfz...42...14K Altcode:
No abstract at ADS
---------------------------------------------------------
Title: A complex study of the microturbulent velocity and damping
constant in the solar photosphere. V - Preliminary results of a
determination of the damping constant for Fe I lines
Authors: Gurtovenko, E. A.
1979AAfz...39...37G Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Complex investigation of the 'microturbulent' velocity and
attenuation constant in the solar photosphere. II - Determination
of the abundance of iron from weak Fraunhofer lines of Fe I
Authors: Gurtovenko, E. A.; Fedorchenko, G. L.; Sheminova, V. A.
1979AAfz...37...22G Altcode:
In the present study, the abundance of iron in the photosphere is
determined by comparing the observed and calculated equivalent line
widths of 93 weak lines of Fe I. The HSRA photospheric model and the
semiempirical gf values, tabulated by Kurucz and Peytremann (1975)
are used in the calculations. A mean value of 7.82 plus or minus 0.05
is obtained for the abundance of iron.
---------------------------------------------------------
Title: Complex investigation of the 'microturbulent' velocity and
damping constant in the solar photosphere. I - Introductory review
Authors: Gurtovenko, E. A.
1979AAfz...37...12G Altcode:
In the present paper, one-component (homogeneous) photospheric
models are applied to the analysis of the microturbulent velocity
and attenuation constant, each of which has a pronounced effect on
the Fraunhofer line profiles and equivalent line widths. A close
relationship between the microturbulence and attenuation constant is
established. It is recommended to determine the value of microturbulence
solely from the equivalent absorption line widths.
---------------------------------------------------------
Title: Double-diffraction monochromator of the Kiev-Golosseevo
Observatory with a digital system for automation of observations
and solar-spectrum processing
Authors: Gurtovenko, E. A.; Kostyk, R. I.
1979AAfz...39...88G Altcode:
No abstract at ADS
---------------------------------------------------------
Title: A complex study of the microturbulent velocity and damping
constant in the solar photosphere. IV - an error study of the method
of damping constant determination
Authors: Gurtovenko, E. A.; Bondarenko, N. F.
1979AAfz...39...31G Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Combined study of the 'microturbulent' velocity and
damping parameter in the solar photosphere. III - Determination of
'microturbulent' velocity from equivalent widths of Fe I lines
Authors: Sheminova, V. A.; Gurtovenko, E. A.
1979AAfz...38...29S Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Comparison of Effective Depths of Fraunhofer Line Formation
Calculated by Various Methods
Authors: Gurtovenko, E. A.; Ratnikova-Sheminova, V. A.
1978SoPh...58..241G Altcode:
The effective depths of formation of some typical Fraunhofer lines,
calculated by the methods suggested by Gurtovenko et al. (1974),
Beckers and Milkey (1975), and Makita (1977) are compared.
---------------------------------------------------------
Title: The effective depths of formation of weak Fraunhofer lines. I.
Authors: Sheminova, V. A.; Gurtovenko, E. A.
1978AAfz...36...21S Altcode:
Previous work on the determination of effective formation depths of weak
Fraunhofer lines is reviewed. It is shown that the effective depths
of weak lines computed from the Unsoeld-Pecker contribution function
correspond to the depths at which fluctuations in the parameters
that determine the line absorption factor have the greatest effect
on variations in the observed profile of an absorption line. Formulas
are given for calculating the effective formation depths of weak lines
of various atoms and ions in the solar photosphere. Numerical results
are presented for C I, N I, O I, Mg I and II, Si I and II, S I, Ca I
and II, Sc I and II, Ti I and II, V I, Cr I and II, Fe I and II, Co I,
Ni I, and Zn I and II.
---------------------------------------------------------
Title: Comparison of the profiles of weak Fraunhofer lines with the
profile of the absorption coefficient.
Authors: Gurtovenko, E. A.; Ratnikova, V. A.
1977AAfz...32....3G Altcode:
Optical and geometric depths relative to 5000 A are calculated for three
Fe I lines with the same excitation potential and different intensities:
6097 A (central intensity of 2.9%), 6392 A (central intensity of 18.8%),
and 6240 A (central intensity of 50.4%). The results show that the
depths at which the absorption-coefficient profile is close to the
line profile are not greater than the limits of the layer determining
the main region of absorption-line formation for lines with central
depressions of less than 25% to 30%.
---------------------------------------------------------
Title: Study of amplitude of photospheric velocity field based on
weak Fraunhofer lines of metals
Authors: Gurtovenko, E. A.
1976SvA....19..488G Altcode:
No abstract at ADS
---------------------------------------------------------
Title: The general photospheric velocity field.
Authors: Gurtovenko, E. A.
1976AAfz...28...93G Altcode:
The radial and tangential components of the general photospheric
velocity field obtained by a variety of authors are compared. Fairly
good correlation between results obtained by different methods from
different observational material was found. A sharp growth of both
components with increasing depth was found in the layers of the
photosphere in which the absorption lines used in the investigation
are formed. Expressions governing the change of the radial and
tangential components with depth are derived on the basis of the
results of averaging the weighted data reported by the different
authors considered.
---------------------------------------------------------
Title: Non-thermal broadening of weak lines
Authors: Gurtovenko, E. A.; de Jager, C.; Lindenbergh, A.; Rutten,
R. J.
1976pmas.conf..331G Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Study of microturbulence from equivalent widths of moderate
and moderately strong Fe I lines.
Authors: Gurtovenko, E. A.; Ratnikova, V. A.
1976AAfz...30...14G Altcode:
Equivalent widths of 25 weak and moderately strong Fe I Fraunhofer
lines are analyzed using data from center-limb observations of the
solar disk. An iron abundance with a logarithm of 7.04 is derived from
the weak lines. Microturbulent velocity fields are investigated by
employing the abundance values derived from moderately strong lines. A
model of quasi-isotropic microturbulent velocity smoothly increasing
with height from 0.6 km/s to 1.5 km/s (mean value, 1.1 km/s) over
the depth range between 100 and 600 km is obtained for a specified
photospheric model. It is concluded that microturbulent velocity can
be determined only by analyzing absolute values of equivalent line
widths and that the microturbulent-velocity model can be improved by
analyzing lines formed at different depths.
---------------------------------------------------------
Title: The Total Photospheric Motion Field
Authors: Gurtovenko, E. A.
1975SoPh...45...25G Altcode:
Brief consideration is given to the conception of the total photospheric
motion field. A synthesis of the most thorough investigations is made
and the radial (V<SUP>rad</SUP>) and tangential (V<SUP>tg</SUP>)
components of the velocity amplitude of the total photospheric
motion field are deduced. At depth logτ<SUB>5</SUB> = −3.0
V<SUP>rad</SUP> and V<SUP>tg</SUP> have average values of 1.2
and 1.7 km s<SUP>−1</SUP> respectively. They increase smoothly
with depth and reach their maximum values of V<SUP>rad</SUP>=3.0,
V<SUP>tg</SUP>=3.4 km s<SUP>−1</SUP> at depths logτ<SUB>5</SUB>=
−0.2 and logτ<SUB>5</SUB> = +0.4 respectively. In the deep
photospheric layers both components seem to decrease with depth.
---------------------------------------------------------
Title: Study of amplitude of photospheric velocity field based on
weak Fraunhofer lines of metals
Authors: Gurtovenko, E. A.
1975AZh....52..804G Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Supplementary Remarks to `On the Average Depth of Formation of
Weak Fraunhofer Lines' by E. Gurtovenko, V. Ratnikova, and C. de Jager
Authors: Gurtovenko, E.; Ratnikova, V.; de Jager, C.
1975SoPh...42...43G Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Dependence of the formation depth of the weak Fraunhofer
lines on atomic parameters
Authors: Gurtovenko, E. A.; Ratnikova, V. A.
1975SvA....18..609G Altcode:
Using an electronic digital computer, the average depth of the formation
of weak Fraunhofer lines is calculated. A dependence of these depths
on the lower-level excitation potential is evident. The average optical
depth of the formation of weak absorption lines is determined mainly by
the excitation potential of the lower level. The larger the excitation
potential, the deeper is the formation of the absorption band. The
average depths depend also on such factors as the ionization potentials
of the neutral atom and iron, and on the partition functions. The joint
effect of these parameters can be different for lines of various atoms
and ions. A graph for some atoms and ions showing the dependences of
the average optical depth on the excitation potentials is included.
---------------------------------------------------------
Title: The center-to-limb change of profiles of weak Fraunhofer
lines. V. The radial and tangential components of the amplitude of
the photospheric velocity field.
Authors: Gurtovenko, E. A.
1975AAfz...27...67G Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Centre-to-limb change of the profiles of weak Fraunhofer
lines. IV. Interpretation of the width of various lines in the solar
disc centre.
Authors: Gurtovenko, E. A.
1975AAfz...26...78G Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Profiles of selected Fraunhofer lines for various center-limb
positions on the solar disk
Authors: Gurtovenko, E. A.; Kostyk, R. I.; Orlova, T. V.; Troian,
V. I.; Fedorchenko, G. L.
1975KiIND....Q....G Altcode:
The profiles of 98 Fraunhofer lines are tabulated for five positions
(cos theta equals 1.00, 0.80, 0.60, 0.44, and 0.28) on the disk of
the quiet sun. The data are based primarily on observations in the
wavelength range 5700 to 6400 A made with a double solar spectrometer.
---------------------------------------------------------
Title: Variation in the centre-limb profiles of weak Fraunhofer
lines 2 asymmetry and line widths
Authors: Gurtovenko, E. A.
1974STIN...7528996G Altcode:
The observations were performed using a double-solar monochromator. The
asymmetry of very weak lines was found to be highly varied, which may
be associated with the superfine structure. Results are in accord with
the theoretical interpretation of the asymmetry of traveling sonic
waves. Observations of the same lines on different dates indicate
a possible change in asymmetry with time. The turbulence velocities
calculated from the widths of certain elements exhibit considerable
diversity. The lines of the light elements S, Si, and N appear to be
very wide. The effect of superfine and isotopic structure is shown to
change to a marked degree the form and width of the profiles of many
Fraunhofer lines.
---------------------------------------------------------
Title: Dependence of the formation depth of the weak Fraunhofer
lines on atomic parameters
Authors: Gurtovenko, E. A.; Ratnikova, V. A.
1974AZh....51.1032G Altcode:
Using an electronic digital computer, the average depth of the formation
of weak Fraunhofer lines is calculated. A dependence of these depths
on the lower-level excitation potential is evident. The average optical
depth of the formation of weak absorption lines is determined mainly by
the excitation potential of the lower level. The larger the excitation
potential, the deeper is the formation of the absorption band. The
average depths depend also on such factors as the ionization potentials
of the neutral atom and iron, and on the partition functions. The joint
effect of these parameters can be different for lines of various atoms
and ions. A graph for some atoms and ions showing the dependences of
the average optical depth on the excitation potentials is included.
---------------------------------------------------------
Title: On the Average Optical Depth of Formation of Weak Fraunhofer
Lines
Authors: Gurtovenko, E.; Ratnikova, V.; De Jager, C.
1974SoPh...37...43G Altcode:
Methods for the determination of the average optical depth of formation
of weak Fraunhofer lines are compared, and their relative merits are
discussed. Distinction should be made between the region of origin
of the emergent radiation, and of the line depression. For weak or
fairly weak lines the average optical depth of formation of the line
depression is the relevant quantity; it should be determined by using
a computational scheme based on the classical weighting functions
of line formation; other methods give physically unsignificant or
conflicting results.
---------------------------------------------------------
Title: The Determination of the Velocity Amplitude of the Total
Photospheric Motion Field. I: The Use of the Weak and Moderately
Weak Lines
Authors: Kondrashova, N. N.; Gurtovenko, E. A.
1974SoPh...34..291K Altcode:
By the analysis of the profiles of 20 weak lines observed at five
centre-to-limb positions on the solar disk, radial and tangential
components of the velocity amplitude of the photospheric motion field
are derived in the range of optical depth - 3.0 ⩽ lgτ5 ⩽ +0.5.
---------------------------------------------------------
Title: Empirical analysis of deviations from LTE in moderate
Fraunhofer lines.
Authors: Gurtovenko, E. A.; Troian, V. I.; Fedorchenko, G. L.
1974AAfz...23...69G Altcode:
A method is developed for empirically determining the line source
function by means of studying multiplet pairs in center-to-limb
observations of the solar disk. The method enables the line source
function to be compared with the continuum source function in a given
region of optical depth. The ratio of continuum source function to
line source function does not exceed 1.2.
---------------------------------------------------------
Title: Change in Center-Line Profiles of Faint Fraunhofer Lines. I.
Authors: Gurtovenko, E. A.; Kondrashova, N. N.
1973aars.conf..117G Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Determining Optical Depth in Different Parts of the Fraunhofer
Line Contour
Authors: Gurtovenko, E. A.
1973aars.conf..111G Altcode:
No abstract at ADS
---------------------------------------------------------
Title: A change in centre-limb profiles of faint Fraunhofer
lines. III. Profile shapes and velocity field.
Authors: Gurtovenko, E. A.
1973AAfz...19...35G Altcode:
No abstract at ADS
---------------------------------------------------------
Title: On physical conditions in the corona from spectral observations
of the solar eclipse on March 7, 1970.
Authors: Gurtovenko, E. A.; Alikayeva, K. V.
1972AAfz...15...55G Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Centre-to-limb change of faint Fraunhofer line
profiles. II. Asymmetry and width of lines.
Authors: Gurtovenko, E. A.
1972AAfz...16...77G Altcode:
No abstract at ADS
---------------------------------------------------------
Title: On the empirical determination of the source function.
Authors: Gurtovenko, E. A.; Fedorchenko, G. L.
1972AAfz...16...61G Altcode:
No abstract at ADS
---------------------------------------------------------
Title: The Physical Conditions in Inner Corona Derived from Spectral
Data of the Solar Eclipse on 7 March, 1970 (Papers presented at the
Proceedings of the International Symposium on the 1970 Solar Eclipse,
held in Seattle, U. S. A. , 18-21 June, 1971.)
Authors: Gurtovenko, E. A.; Alikayeva, K. V.
1971SoPh...21..325G Altcode:
The spectrum of the solar corona obtained during the eclipse of 7 March,
1970 has been studied. From the analysis of the line halfwidths it is
concluded that the emission of coronal lines of various groups arises
in different volumes of the corona. The lines λ5303 and λ4231 are
analyzed in detail and by the use of the equations of excitation
and ionization balance. The distribution of electron temperature
T<SUB>e</SUB> and density n<SUB>e</SUB> vs height in the solar corona
has been found. The usually adopted n<SUB>e</SUB> and T<SUB>e</SUB> are
noticeably less than those values obtained in present analysis. This
discrepancy may be due to the fact that the considered area of the
corona seems to be in an unusual condition.
---------------------------------------------------------
Title: The Use of the Goldberg-Unno Method for the Investigation of
Small-Scale Photosphere Motions
Authors: Gurtovenko, E.; Troyan, V.
1971SoPh...20..264G Altcode:
The Goldberg-Unno method is analysed. Accounting for the instrumental
profile correction reduces the derived microturbulent velocities
only slightly. A similar effect may be caused by an unresolved
macroturbulence. The method of accounting for the damping effect is
considered. The correction for the influence of the damping effect
does not change substantially the general trend of the variation
of ξ<SUB>t</SUB> with τ<SUB>0</SUB>. The microturbulent velocity
ξ<SUB>t</SUB> is reduced appreciably.
---------------------------------------------------------
Title: Effect of Macroturbulence on Fraunhofer Line Profiles.
Authors: Gurtovenko, É. A.; Ratnikova, V. A.
1971SvA....14..845G Altcode:
No abstract at ADS
---------------------------------------------------------
Title: On the Problem of the Flare-Like Emission in Sodium Lines
Authors: Gurtovenko, E. A.
1971SoPh...16..413G Altcode:
Unusual and intense emission in the D<SUB>1</SUB>, D<SUB>2</SUB> lines
has been registered photoelectrically in an undisturbed region near
the center of the solar disk on 28 July, 1966. Various aspects of the
possibility that the emission might originate in either artificial or
natural comets by processes of resonance scattering or flu orescence
have been analyzed. It is shown that the observed emission can only
be located on the solar surface. Some aspects of the problem are
discussed briefly.
---------------------------------------------------------
Title: Effect of Macroturbulence on Fraunhofer Line Profiles.
Authors: Gurtovenko, É. A.; Ratnikova, V. A.
1970AZh....47.1053G Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Determining Optical Depth in Different Parts of the Fraunhofer
Line Contour
Authors: Gurtovenko, E. A.
1970asas.book..111G Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Spectral observations of the chromosphere and corona during
the total solar eclipse on March 7, 1970.
Authors: Gurtovenko, E. A.; Skorik, K. E.
1970ATsir.580....1G Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Change in Center-Line Profiles of Faint Fraunhofer Lines. I.
Authors: Gurtovenko, E. A.; Kondrashova, N. N.
1970asas.book..117G Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Center-to-limb variation of faint Fraunhofer lines. I.
Authors: Gurtovenko, E. A.; Kondrashova, N. N.
1970AAfz....9...93G Altcode:
No abstract at ADS
---------------------------------------------------------
Title: On the determination of optical depth for different parts of
Fraunhofer profiles.
Authors: Gurtovenko, E. A.
1970AAfz....9...89G Altcode:
No abstract at ADS
---------------------------------------------------------
Title: The Use of a Laser Beam for Investigating the Instrumental
Profile of a Double-Pass Solar Spectrograph
Authors: Gurtovenko, E. A.; Fedorenko, L. U.
1969SoPh....6..465G Altcode:
Some peculiarities of the use of a laser for the determination of the
instrumental profile of the high-resolution spectrograph have been
described. The results of the investigation of the instrumental profile
of the Kiev-Golosejevo double-pass solar spectrograph are presented
in graphs.
---------------------------------------------------------
Title: Active prominences of 9 and 11 July 1966.
Authors: Gurtovenko, E. A.; Morozhenko, N. N.; Rakhubovsky, A. S.
1969AIQSY...3...96G Altcode:
No abstract at ADS
---------------------------------------------------------
Title: The horizontal solar telescope ATSU-5 with a double diffraction
spectrograph.
Authors: Gurtovenko, E. A.
1969AAfz....8...77G Altcode:
No abstract at ADS
---------------------------------------------------------
Title: On the density of Na in comet Ikeya-Seki (1965f).
Authors: Gurtovenko, E. A.
1969AAfz....4..155G Altcode:
No abstract at ADS
---------------------------------------------------------
Title: On the influence of the width of the intermediate slit of a
double monochromator on the profiles of the Fraunhofer lines.
Authors: Gurtovenko, E. A.
1969BSolD1969...91G Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Study of the turbulence in the solar photosphere from the Ti
I-line profiles.
Authors: Gurtovenko, E. A.; Troyan, V. I.
1969AAfz....8...85G Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Solar Physics at the Main Astronomical Observatory of the
Ukrainian Academy of Sciences
Authors: Gurtovenko, E. A.
1968SoPh....4..108G Altcode:
No abstract at ADS
---------------------------------------------------------
Title: A Peculiar Sodium 'Flare' on the Sun
Authors: Gurtovenko, E. A.
1967SoPh....1..389G Altcode:
A peculiar brightening was observed near the centre of the D<SUB>2</SUB>
line of NaI on July 28, 1966, in a position where no activity could be
seen in the Hα line but where a new important active region formed
during the next rotation of the sun. The brightening, first observed
at 06:30 UT, progressively faded and disappeared before 07:10 UT.
---------------------------------------------------------
Title: Computer Correction of Line Profiles for Instrumental Error.
Authors: Gurtovenko, É. A.
1966SvA....10..520G Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Computer Correction of Line Profiles for Instrumental Error.
Authors: Gurtovenko, É. A.
1966AZh....43..659G Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Three-Color Colorimetry of the Integral Brightness of Mars,
Based on 1956 Observations.
Authors: Gurtovenko, E. A.; Gordeladze, Sh. G.
1957SvA.....1..926G Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Three-Color Colorimetry of the Integral Brightness of Mars,
Based on 1956 Observations.
Authors: Gurtovenko, E. A.; Gordeladze, Sh. G.
1957AZh....34..959G Altcode:
No abstract at ADS
