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Author name code: skomorovsky
ADS astronomy entries on 2022-09-14
author:"Skomorovsky, Valery I."
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Title: Iceland spar and birefringent filter (BF) development
Authors: Skomorovsky, Valery; Kushtal, Galina; Tokareva (Lopteva),
Lyubov
2022STP.....8a..69S Altcode:
Birefringent crystals for BF are required to provide the necessary
linear aperture, wavefront quality, and filter transmission in a
given spectral region. Based on the review of foreign and domestic
BF developments, the difficulties in using crystals from known
deposits are examined. The Institute of Solar-Terrestrial Physics
has developed BFs with extreme characteristics, using an innovative
method for enriching crystals from East Siberian deposits and new
methods for optical treatment and control of BF elements. We present
the characteristics of the filters. Further progress in the creation of
BFs in our country depends on the availability of necessary synthetic
crystals and natural crystal of Iceland spar, which turned out to be
a difficult fate in Russia.
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Title: Project of the Large Solar Telescope with mirror 3 m in
diameter
Authors: Grigoryev, Victor; Demidov, Mikhail; Kolobov, Dmitriy;
Pulyaev, Vasiliy; Skomorovsky, Valery; Chuprakov, Sergey
2020STP.....6b..14G Altcode: 2020SZF.....6b..19G
One of the most important problems of modern solar physics is the
observation of the small-scale structure of the solar atmosphere at
various heights (including the chromosphere and corona) in different
spectral lines. Such observations can be made only with large solar
telescopes whose main mirror has a diameter of at least 3 m. Currently,
several large solar telescopes are under construction or development in
the world. In 2013 in Russia, the work began on the development of a
national large solar telescope with a mirror 3 m in diameter (LST-3),
which is a part (subproject) of the National Heliogeophysical Complex
of the Russian Academy of Sciences. The telescope is planned to be
located in the Sayan Solar Observatory at an altitude of more than 2000
m. The choice was made in favor of the classic axisymmetric Gregory
optical layout on an alt-azimuth mount. The scientific equipment of
LST-3 will consist of several systems of narrow-band tunable filters
and spectrographs for various wave ranges. The equipment will be
placed both in the main coude focus on a rotating platform and in
the Nasmyth focus. To achieve a diffraction resolution, high-order
adaptive optics (AO) will be used. It is assumed that with a certain
modification of the optical configuration, LST-3 will work as a 0.7
m mirror coronograph in near infrared lines and can also be used for
observing astrophysical objects in the nighttime.
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Title: Chromospheric K CaII telescope of Baikal Astrophysical
Observatory.
Authors: Lopteva, Lyubov; Kushtal, Galina; Proshin, Vladimir;
Skomorovsky, Valery; Firstov, Sergey; Khimich, Valeriy; Chuprakov,
Sergey
2019STP.....5b.116L Altcode: 2019SZF.....5b.133L
In recent years, most results of CaII studies of the solar chromosphere
in H and K lines have been based on observations with narrow passband
filters. The Baikal Observatory's full-disk chromospheric telescope
for the K CaII line with a birefringent filter (BF) has again
been included in observation programs of the Sun Service Station
and scientific research. We analyze the methods of telescope and
modernized birefringent filter adjustment. After many years of
continuous operation, a pressing need arose to replace the damaged
parts of the chromospheric telescope. Optics and mechanics of the entire
telescope have been cleaned and readjusted. Wavefront interferograms of
the teleobjective lens and of the whole telescope show that wavefront
distortions of the entire optical path are within 0.25 λ. We present
an optical scheme and discuss optical-physical characteristics of
BF elements. The interference prefilter and UV polarizers have been
replaced, and passbands of BF tunable stages have been adjusted. The BF
spectral characteristics provide a fairly high contrast of monochromatic
images of large-scale phenomena. Unfortunately, with a collimator
and Sony Cyber-Shot DSC-S85 camera, mounted on the telescope, the
theoretical resolution of the 180-mm telescope is not realized. We
have therefore calculated two optical schemes of telescope changes
for possible improvement in spatial resolution.
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Title: Commercial narrowband Fabry-Perot solar filters, methods and
instruments for their examination
Authors: Skomorovsky, Valery; Kushtal, Galina; Lopteva, Lyubov;
Proshin, Vladimir; Tsayukova, Alla
2015SZF.....1c..72S Altcode:
Nowadays, Coronado, Lunt, Solar Spectrum, Daystar and Solarscope
companies advance available narrowband solar filters. Being installed
in small telescopes they allow amateurs not only to admire grand
phenomena in the solar atmosphere but also to be involved in scientific
observations. The efforts of the companies aimed at achieving extreme
values of Fabry-Perot (FP) filter basic parameters such as full width
at half-maximum, angular field of view, filter clear aperture and
uniformity of passband over the aperture, to make them suitable
for scientific observations. Parameters of commercial filters,
their compliance with the requirements depend on filter design and
technology developed by companies. This study considers narrowband
FP filters designs proposed by five leading companies, and some
technological problems of their production, which are important for
their operation. To use commercial filters in professional research, it
is necessary to be sure that the filter parameters declared by companies
correspond to real ones. The methods and devices proposed by authors
allow high-precision measuring integral and local characteristics
of FP filter and its spectral uniformity across the aperture. Also,
we can estimate the quality of optical stack and filter suitability
for professional solar observations.
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Title: Wide-field Solc-type birefringent filter
Authors: Skomorovsky, Valery I.; Kushtal, Galina I.; Sadokhin,
Valery P.
2012SPIE.8446E..6VS Altcode:
A 24-element wide-field Solc birefringent filter (WFSBF) has been
produced and tested for the first time. WFSBF is a second unit to the
3-unit BF designed for imaging solar magnetic fields in the FeI 6173
Å spectral line. WFSBF passband full width at half maximum is 0.2
Å. The optical stage of the Solc BF is apodized. The main passband
has a two-peak profile, to increase BF transmittance in spectral line
wings. The neighbouring passbands at 2 Å are cut off by the first BF
unit. To measure magnetic fields, a narrower passband of the third BF
unit is to scan the spectral line wings in the +/-0.05Å positions,
in accordance with two-peak positions of the Solc filter profile. The
wide field of view (FOV) of the Solc filter was reached with composite
birefringent stages of 24 positive artificial paratellurite and 24
negative natural calcite crystals. FOV of a composite stage is eleven
times larger than that of the only-calcite one. The calculated passband
is compared to the experimental one. Technological aspects of the
manufacture as well as devices for plate orientation are discussed.
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Title: Development of adaptive optics elements for solar telescope
Authors: Lukin, V. P.; Grigor'ev, V. M.; Antoshkin, L. V.; Botugina,
N. N.; Kovadlo, P. G.; Konyaev, P. A.; Kopulov, E. A.; Skomorovsky,
V. I.; Trifonov, V. D.; Chuprakov, S. A.
2012SPIE.8447E..6EL Altcode:
The devices and components of adaptive optical system ANGARA, which
is developed for image correction in the Big solar vacuum telescope
(BSVT) at Baykal astrophysical observatory are described. It is shown
that the use of modernized adaptive system on BSVT not only reduces the
turbulent atmospheric distortions of image, but also gives a possibility
to improve the telescope developing new methods of solar observations. A
high precision Shack-Hartmann wavefront (WF) sensor has been developed
on the basis of a low-aperture off-axis diffraction lens array. The
device is capable of measuring WF slopes at array sub-apertures of
size 640X640 μm with an error not exceeding 4.80 arc.sec. Also the
modification of this sensor for adaptive system of solar telescope
using extended scenes as tracking objects, such as sunspot, pores, solar
granulation and limb, is presented. The software package developed for
the proposed WF sensors includes three algorithms of local WF slopes
estimation (modified centroids, normalized cross-correlation and fast
Fourier-demodulation), as well as three methods of WF reconstruction
(modal Zernike polynomials expansion, deformable mirror response
functions expansion and phase unwrapping), that can be selected during
operation with accordance to the application.
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Title: White-Light Observations and Polarimetric Analysis of the
Solar Corona During the Eclipse of 1 August 2008
Authors: Skomorovsky, V. I.; Trifonov, V. D.; Mashnich, G. P.;
Zagaynova, Y. S.; Fainshtein, V. G.; Kushtal, G. I.; Chuprakov, S. A.
2012SoPh..277..267S Altcode:
In order to study the solar corona during eclipses, a new telescope
was constructed. Three coronal images were obtained simultaneously
through a single objective of the telescope as the coronal radiation
passed through three polarizers (whose transmission directions were
turned 0°, 60°, and 120° in the chosen direction); one image was
obtained without a polarizer. The telescope was used to observe the
solar corona during the eclipse of 1 August 2008. We obtained the
distributions of polarization brightness, K-corona brightness, the
degree of K-corona polarization and the total polarization degree;
the polarization direction, depending on the latitude and radius in
the plane of the sky, was also obtained. We calculated the radial
distributions of electron density depending on the latitude. The
properties of all these distributions were compared for different
coronal structures. We determined the temperature of the coronal plasma
in different coronal structures assuming hydrostatic equilibrium.
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Title: The solar corona during the eclipse of August 1, 2008
Authors: Skomorovsky, V. I.; Trifonov, V. D.; Mashinch, G. P.;
Zaiganova, Yu. S.; Fainshtein, V. G.; Kushtal', G. I.; Chuprakov, S. A.
2011Ge&Ae..51.1063S Altcode:
A new telescope has been created to investigate the solar corona
during eclipses. One lens simultaneously forms three corona images
occurring as coronal radiation passes through three polarizers with
transmission directions rotated 0°, 60°, and 120° relative to
the selected direction; in addition, one image is formed without
the polarizer. The telescope was used for solar corona observation
during the eclipse of August 1, 2008. We obtained the distributions
of polarization brightness, K corona brightness, degree of K corona
polarization, and total degree of polarization as well as polarization
directions depending on the latitude and radius in the sky plane. Radial
distributions of the electron density depending on latitude were
calculated. The coronal plasma temperature was determined for different
corona structures under the assumption of hydrostatic equilibrium.
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Title: Characteristic features of the solar corona during the eclipse
of 1 August 2008
Authors: Skomorovsky, V. I.; Trifonov, V. D.; Mashnich, G. P.;
Zagaynova, Yu. S.; Fainshtein, V. G.; Kushtal, G. I.; Chuprakov, S. A.
2011arXiv1105.0779S Altcode:
In order to study the solar corona during eclipses, a new telescope was
constructed. Three coronal images were obtained simultaneously from one
objective of the telescope as the coronal radiation passed through three
polarisers (whose transmission directions were turned through 0^{\circ},
60^{\circ}, and 120^{\circ} to the chosen direction); one image without
polariser was also obtained. The telescope was used to observe the solar
corona during the eclipse of 1 August 2008. We obtained distributions of
the polarisation brightness, K-corona brightness, degree of the K-corona
polarisation and total polarisation degree; polarisation direction
depending on the latitude and radius in the plane of the sky was also
obtained. We calculated radial distributions of electron density,
depending on the latitude. Properties of all these distributions in
different coronal structures were compared. We determined temperature
of coronal plasma in different coronal structures on the assumption
that there is a hydrostatic equilibrium.
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Title: The Irkutsk Barium filter for narrow-band wide-field
high-resolution solar images at the Dutch Open Telescope
Authors: Hammerschlag, Robert H.; Skomorovsky, Valery I.; Bettonvil,
Felix C. M.; Kushtal, Galina I.; Olshevsky, Vyacheslav L.; Rutten,
Robert J.; Jägers, Aswin P. L.; Sliepen, Guus; Snik, Frans
2010SPIE.7735E..85H Altcode: 2010SPIE.7735E.265H
A wide-field birefringent filter for the barium II line at 455.4nm is
developed in Irkutsk. The Barium line is excellent for Doppler-shift
measurements because of low thermal line-broadening and steep
flanks of the line profile. The filter width is 0.008nm and the
filter is tunable over 0.4nm through the whole line and far enough
in the neighboring regions. A fast tuning system with servomotor is
developed at the Dutch Open Telescope (DOT). Observations are done
in speckle mode with 10 images per second and Keller-VonDerLühe
reconstruction using synchronous images of a nearby bluecontinuum
channel at 450.5nm. Simultaneous observation of several line positions,
typically 3 or 5, are made with this combination of fast tuning and
speckle. All polarizers are birefringent prisms which largely reduced
the light loss compared to polarizing sheets. The advantage of this
filter over Fabry-Perot filters is its wide field due to a large
permitted entrance angle and no need of polishing extremely precise
surfaces. The BaII observations at the DOT occur simultaneously with
those of a fast-tunable birefringent H-alpha filter. This gives the
unique possibility of simultaneous speckle-reconstructed observations
of velocities in photosphere (BaII) and chromosphere (H-alpha).
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Title: Possibilities for the application of adaptive optics at
solar telescopes
Authors: Lukin, V. P.; Grigoryev, V. M.; Antoshkin, L. V.; Botygina,
N. N.; Yemaleev, O. N.; Konyaev, P. A.; Kovadlo, P. G.; Skomorovsky,
V. I.
2009Ge&Ae..49.1128L Altcode:
Possibilities for the application of adaptive optics at solar
telescopes are studied. A modified correlation tracker to measure
the image motion at the first focus of the Big Solar Vacuum Telescope
(BSVT) at the Baikal Astrophysical Observatory of the Institute for
Solar-Terrestrial Physics, the Siberian Branch of the Russian Academy
of Sciences, has been investigated experimentally.
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Title: Studying instrumental linear polarization at the Large Solar
Vacuum Telescope (LSVT)
Authors: Firstova, N. M.; Polyakov, V. I.; Skomorovsky, V. I.;
Grigoriev, V. M.
2009Ge&Ae..49..927F Altcode:
Impact linear polarization in solar flares is studied with the
Large Solar Vacuum Telescope (LSVT) using the spectral polarimetric
method. This method makes it possible to minimize the effect of
instrumental polarization with an error of up to 10<SUP>-2</SUP> owing
to the normalization of the spectral line intensity to the continuum
spectrum intensity with negligible linear polarization. As a result,
the Hα line intensity in two orthogonally polarized spectral stripes
coincides in the absence of solar polarization. However, in the presence
of linear polarization in a flare, the spectral polarimetric method does
not rule out that the error can be present in determining the Stokes
parameters Q and U because of their possible relative “leakage.”
Linear instrumental polarization of LSVT has been performed using
polaroid rotation before the major mirror. Twelve elements of a
telescope matrix, characterizing linear polarization, have been
determined. The usage of a matrix makes it possible to specify the
observed Q and U values accurate to 10<SUP>-3</SUP> of their magnitude.
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Title: Tests of the adaptive optical system with a modified
correlation sensor at the big solar vacuum telescope
Authors: Lukin, V. P.; Grigor'ev, V. M.; Antoshkin, L. V.; Botygina,
N. N.; Emaleev, O. N.; Konyaev, P. A.; Kovadlo, P. G.; Skomorovskii,
V. I.
2008SPIE.7108E..0KL Altcode: 2008SPIE.7108E..16L
The possibility of applying adaptive correction to ground-based
solar astronomy is considered. Several experimental systems for image
stabilization are described along with the results of their tests. As
a result of the installation of the first order adaptive-optics
system, the Big Solar Vacuum Telescope (BSVT) acquired the new
quality. Different ways of development of an adaptive correction
to be used in the BSVT of the Baikal Astrophysical Observatory are
discussed. Tests of the modified correlation sensor (MCS) at BSVT have
shown that at a proper choice of the filtering function parameters,
the MCS reliably measures shifts of the solar granulation image in
the telescope first focus under good visibility conditions. The MCS,
as a part of the adaptive optical system, was intended for measuring
the image shift in the telescope second focus. It turned out that
the image quality becomes noticeably worse at image transfer to the
second focus. The MCS measures the image shift of solar granulation in
the second focus only under extremely good visibility conditions and
certain granulation structure. Reduction of the telescope entrance
aperture to 170 mm insignificantly affects the image quality and,
therefore, the MCS operation.
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Title: Adaptive optics system application for solar telescope
Authors: Lukin, V. P.; Grigor'ev, V. M.; Antoshkin, L. V.; Botugina,
N. N.; Emaleev, O. N.; Konyaev, P. A.; Kovadlo, P. G.; Krivolutskiy,
N. P.; Lavrionova, L. N.; Skomorovski, V. I.
2008SPIE.7015E..6TL Altcode: 2008SPIE.7015E.187L
The possibility of applying adaptive correction to ground-based
solar astronomy is considered. Several experimental systems for image
stabilization are described along with the results of their tests. Using
our work along several years and world experience in solar adaptive
optics (AO) we are assuming to obtain first light to the end of 2008
for the first Russian low order ANGARA solar AO system on the Big Solar
Vacuum Telescope (BSVT) with 37 subapertures Shack-Hartmann wavefront
sensor based of our modified correlation tracker algorithm, DALSTAR
video camera, 37 elements deformable bimorph mirror, home made fast
tip-tip mirror with separate correlation tracker. Too strong daytime
turbulence is on the BSVT site and we are planning to obtain a partial
correction for part of Sun surface image.
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Title: Proposal Large Solar Telescope in Russia
Authors: Grigor'ev, Victor; Pimenov, Yuri; Papushev, Pavel;
Skomorovsky, Valery; Kamus, Sergey
2006IAUSS...1E..19G Altcode:
The general requirements upon more than 2.5 m in diameter Solar
Telescope-Coronograph and potentialities manufacture of 2.6 m
diameter aplanatics and off-axis Gregory systems are considered. The
azimuthal fork mounting for spectral equipment in Nasmith focus is
designed. The new scheme, lay-out and construction of altazimuthal
Large Solar Telescope are proposed. To produce more than 3-meters
quasi axis telescope with easy tested small polarization is the
main idea of work. It is proposed the classical Gregory system with
additional entrance plane mirror and its construction. The system
combining advantages of coelostat horizontal solar telescope and
symmetrical altazimuthal axis mounting should have high stability of
image quality. Proposed system can be recommended for large up to 6
m telescopes.
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Title: Adaptive optical system for a ground-based solar telescope
Authors: Lukin, V. P.; Antoshkin, L. V.; Botygina, N. N.; Ermaleev,
O. N.; Grigor'ev, V. M.; Konyaev, P. A.; Yankov, A. P.; Kovadlo,
P. G.; Skomorovskii, V. I.
2006JOptT..73..197L Altcode:
This paper discusses a modified adaptive optical system for
a ground-based solar telescope that corrects the influence of
the atmosphere and of technical distortions on the quality of
the resulting image of the object. An adaptive optical system is
developed from traditional optoelectronic systems by incorporating
additional elements, namely a wave-front corrector (an active mirror),
a device for measuring wave-front distortion (a wave-front sensor),
and a reference source that provides an optical signal to set the
wave-front sensor. The angular resolution of an image in the telescope
can reach diffraction resolution as a result of adaptive correction;
i.e., it can be increased by about a factor of 10-25.
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Title: Adaptive System of Tip-Tilt Correction of Image with Modified
Correlation Tracker for BSVT
Authors: Lukin, V.; Antoshkin, L.; Botygina, N.; Emaleev, O.;
Grigor'ev, V.; Konyaev, P.; Kovadlo, P.; Skomorovski, V.; Yankov, A.
2006via..conf..219L Altcode:
The possibility of applying adaptive correction to ground-based
solar astronomy is considered. Several experimental systems for image
stabilization are described along with the results of their tests. As
a result of the installation of the first order adaptive-optics
system, the Big Solar Vacuum Telescope (BSVT) acquired the new
quality. Different ways of development of an adaptive correction to be
used in the BSVT of the Baikal Astrophysical Observatory are discussed.
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Title: The investigation of the solar active regions structure using
the multiwave observations with Large Solar Coronagraph of Sayan
Observatory: the study of spectra and images of the sunspot umbras
in the domain of the line He I 10830 Å
Authors: Chuprakov, S. A.; Kushtal, G. I.; Papushev, P. G.;
Skomorovsky, V. I.; Zagaynova, Yu. S.
2004IAUS..223..183C Altcode: 2005IAUS..223..183C
The solar active regions observations were carried out with facilities
for multi-spectral investigations of solar atmosphere on Large solar
coronagraph of Sayan observatory. The facilities permits to perform
the spectral observations in selected chromospheric and coronal lines
simultaneously with obtaining of H_alpha and He I images.
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Title: Ba II 4554 Å speckle imaging as solar Doppler diagnostic
Authors: Sütterlin, P.; Rutten, R. J.; Skomorovsky, V. I.
2001A&A...378..251S Altcode:
We present observations testing the Dopplergram capability of a
narrow-band (80 mÅ) Lyot filter imaging the solar surface in the
wings of the Ba II 4554 Å resonance line in combination with speckle
reconstruction to obtain high angular resolution. The Ba II 4554 Å line
is found to be an excellent tool for high-resolution Doppler mapping
thanks to opacity insensitivity to temperature variations and line-width
insensitivity to thermal broadening. The resulting Dopplergrams show
concentrated downflows of 1.2-2.2 km;s<SUP>-1</SUP> in intergranular
lanes that probably mark magnetic fluxtubes. Two-wavelength
profile sampling is found to suffice for high-resolution Dopplergram
construction. The filter will be installed as part of a multi-wavelength
speckle imaging system on the new Dutch Open Telescope.
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Title: Investigation of He I 10 830 Å `Dark Points' at the Sayan
Solar Observatory and the Baikal Astrophysical Observatory
Authors: Skomorovsky, V. I.; Firstova, N. M.; Kashapova, L. K.;
Kushtal, G. I.; Boulatov, A. V.
2001SoPh..199...37S Altcode:
A new two-bandpass birefringent filter has been produced at
ISTP, Irkutsk for the investigation of the fine structure of the
chromosphere. One filter passband is centered on the He i 10 830 Å
line, the second one is centered on Hα. The FWHM of the He i 10 830 Å
passband is 0.46 Å and of the Hα passband is 0.3 Å. A large number of
filtergrams were obtained with the filter at the Sayan observatory. At
the same time, spectral observations with high spatial and spectral
resolution were carried out by the large solar vacuum telescope at the
Baikal Observatory. We selected 29 `dark point' spectra with sizes from
2” to 13”, as well as `dark points' on the filtergrams. Comparison of
spectrograms and filtergrams has shown a good agreement of their size
and intensity in relation with the surrounding chromosphere as well
as the absence of primary line-of-sight velocities in both observation
types. From spectral observations, the depth of 10 830 Å is over 30%
for some `dark points', and the FWHM is more than 1 Å. He i 10 830 Å
line profiles in `dark points' are more deep and wide than in quiet
regions. The optical depth of the chromosphere in `dark points' is
estimated. Comparison with the unperturbed chromosphere showed that
`dark points' in He i 10 830 Å are more optically thin than the
nearby chromosphere.
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Title: A Multi-Channel Speckle Imaging System for the DOT
Authors: Sütterlin, P.; Hammerschlag, R. H.; Bettonvil, F. C. M.;
Rutten, R. J.; Skomorovsky, V. I.; Domyshev, G. N.
2001ASPC..236..431S Altcode: 2001aspt.conf..431S
No abstract at ADS
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Title: The Today's Investigations on Large Solar Vacuum Telescope
Authors: Skomorovsky, V. I.; Firstova, N. M.; Kashapova, L. K.;
Firstova, A. V.; Kushtal, G. I.
2001AGM....18.P221S Altcode:
The contribution presents the prospective observations obtained with
the Large Solar Vacuum Telescope (Baikal astrophysical observatory,
Irkutsk) from 1997 after its re-equipment by CCD-camera. During the
latest years we carried out basically the spectropolarimetric Hα
observations of the emission objects of different sizes from the solar
flares to the Ellerman bombs. The flares followed by a surges have
aroused a special interest. The observations and preliminary results are
shown. The Ellerman bombs or moustaches were devoted much attention. We
obtained the extensive observational data( more than 200 objects) and
the various mechanisms of their arising have been analyzed. Besides
the investigation of the linear polarization in Hα line the spectral
observations in IR region (HeI 10830 Å line) were carried out. Also
we obtain the observation of the pores in the several Fe lines for the
latest two years. This work was supported by Russian Foundation for
Basic Research grants 00-02-16068-a and 01-02-06203. Thanks are also
due the State Support of Leading Scientific Schools of the Russian
Federation grant 00-15-96659 and the State Scientific and Technical
Program “Astronomy” for their support.
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Title: First-order adaptive system for correction of images in solar
ground-based telescopes
Authors: Antoshkin, Leonid V.; Borovik, A. B.; Botygina, Nina N.;
Bulatov, Alexei V.; Emaleev, Oleg N.; Firstova, N. M.; Fortes, Boris
V.; Grigoryev, Victor M.; Kovadlo, P. G.; Lavrinova, L. N.; Lukin,
Vladimir P.; Petrov, A. I.; Skomorovsky, Valery I.; Yankov, A. P.
2000SPIE.4007..232A Altcode:
The possibility of applying adaptive-optics devices to ground- based
solar astronomy and high-resolution spectroscopy is considered. Due
to atmospheric turbulence the resolution of ground-based solar
telescopes are limited to 1 arcsec on the average with short period
of subarcsecond resolution at good sites. Application of adaptive
correction is a ground-based telescope to improve image quality is
possible to improve whole performance of telescope to obtain images
with resolution about 0.3' and to improve resolution for spectral
measurements of the Sun. Adaptive Optics represent a visible tool for
increasing the resolution of ground-based telescopes to the level that
will be needed to understand the physical processes occurring on the
Sun. An experimental adaptive- optics system for image stabilization is
described, as well as the results of its tests. Different ways of the
further development of the adaptive-optics system for use in the Big
Solar Vacuum Telescope (BSVT) of the Baikal Astrophysical Observatory
are discussed.
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Title: Program for the 1999 August 11 eclipse
Authors: Grigoriev, V. M.; Eselevich, V. G.; Kashapova, L. K.;
Salakhutdinov, R. T.; Skomorovsky, V. I.
1999CoSka..28..256G Altcode:
A study of the solar coronal fine structure up to 5--6 solar radii
as an indicator of the global and local processes on the Sun. The
experimental detection of fast changes in coronal structures. An
investigation of the minimal and maximal coronal structure (streamer
form) as a result of the plasma layer projection on the picture plane
along the neutral line. Obtaining 8--10 images of the white-light corona
with the radial neutral filter. The special telescope was developed
and manufactured. The telescope tube is directed to (or from) the
polar star. The Sun's tracking is carried out by the whole telescope
tube with the heliostat mirror around the polar axis. The lens of the
telescope is a two-component Petzval type, the diameter is 120 mm,
and the focal length is 1200 mm. The assumed angular resolution at the
region +/-2.5 degree is near 5 arcsec. Data will be recorded either
via an automatic 8-cm aerial camera or using a CCD-detector.
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Title: The Large Vacuum Solar Telescope on the Way to High Resolution
Authors: Boulatov, A.; Grigoryev, V.; Skomorovsky, V.
1999ASPC..183..206B Altcode: 1999hrsp.conf..206B
No abstract at ADS
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Title: A program of Observations for the August 11, 1999 Total
Solar Eclipse
Authors: Grigoriev, V. M.; Eselevich, V. G.; Kashapova, L. K.;
Salakhutdinov, R. T.; Skomorovsky, V. I.
1998jena.conf...12G Altcode:
A study of the solar coronal fine structure up to 5--6 solar radii
as an indicator of the global and local processes on the Sun. The
experimental detection of fast changes in coronal structures. An
investigation of the minimal and maximal coronal structure (streamer
form) as a result of the plasma layer projection on the picture plane
along the neutral line. Obtaining 8--10 images of the white-light corona
with the radial neutral filter. The special telescope was developed
and manufactured. The telescope tube is directed to (or from) the
polar star. The Sun's tracking is carried out by the whole telescope
tube with the heliostat mirror around the polar axis. The lens of the
telescope is a two-component Petzval type, the diameter is 120 mm,
and the focal length is 1200 mm. The assumed angular resolution at the
region ±2.5 degree is near 5 arcsec. Data will be recorded either
via an automatic 8-cm aerial camera or using a CCD-detector.
---------------------------------------------------------
Title: Observation of the eclipsed corona. The origin of the 'minimum'
and 'maximum' corona
Authors: Eselevich, V. G.; Grigoryev, V. M.; Skomorovsky, V. I.;
Salakhutdinov, R. T.
1998ESASP.421..267E Altcode: 1998sjcp.conf..267E
No abstract at ADS
---------------------------------------------------------
Title: The two-bandpass birefringent filter (BF) for the HEL 10830
Å and Hα lines
Authors: Kushtal, G. I.; Skomorovsky, V. I.
1998ESASP.421..329K Altcode: 1998sjcp.conf..329K
No abstract at ADS
---------------------------------------------------------
Title: The Large Solar Vacuum Telescope: the Optical System, and
First Spectral Observations
Authors: Skomorovsky, V. I.; Firstova, N. M.
1996SoPh..163..209S Altcode:
The performance of the optics of the Large Solar Vacuum Telescope
(LSVT) and examples of the spectrograms taken with the spectrograph are
presented. A new pneumo-mechanical support system for the siderostat
mirror and monitoring system of the telescope optics is described.
---------------------------------------------------------
Title: On Filter Observations of Coronal Structures in the Light of
FeX 6374 Angstrom Emission Line
Authors: Guetman, F. I.; Kim, I. S.; Bucher, A.; Druzhinin, C. A.;
Noens, J. -C.; Salakhutdinov, R. T.; Semenikin, A. A.; Skomorovsky,
V. I.
1994scs..conf..575G Altcode: 1994IAUCo.144..575G
The red coronal line of Fe X (6374 Å) seems to be extremely suitable
for filter observations due to reduced sky scattering in this spectral
interval and absence of blending by Fraunhofer lines. Comparative
analysis of location of Hα structures in colour and black-white
pictures of the solar corona of July 11, 1991 was carried out. Care
should be taken when interference filters are used for the red corona
observations. Estimations of parameters of an interference filter for
the reliable red coronal observations are presented.
---------------------------------------------------------
Title: The Optical System of the Large Vacuum Solar Telescope
Authors: Skomorovsky, V.
1993rtpf.conf..140S Altcode:
No abstract at ADS
---------------------------------------------------------
Title: The Sayan Observatory coronograph.
Authors: Papushev, P. G.; Levkovskij, V. I.; Tyagun, N. F.;
Salakhutdinov, R. T.; Skomorovskij, V. I.; Kruglov, V. I.
1992BSolD...6...80P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Red light observations of the solar corona at Abastumani
Authors: Khetsuriani, T. S.; Khutsishvili, Eh. V.; Skomorovskii, V. I.;
Sadokhin, V. P.; Gigolashvili, M. Sh.; Majer, A. K.; Tetruashvili,
Eh. I.
1989AbaOB..66..105K Altcode: 1989AbaOB..66..112K; 1989AbaOB..66..105S
Images of the solar corona in the Fe X 6374-A line were obtained with a
small coronagraph and birefringent filter. The images reveal streamer,
ray, arch, and loop structures. The filter transmits about 5 percent of
the light and has a passband half-width of about 0.6 A. The intensity
of the secondary maxima does not exceed 1 percent. Plans for future
studies using the coronagraph are discussed.
---------------------------------------------------------
Title: A grating interferometer
Authors: Domyshev, G. N.; Skomorovskii, V. I.
1988soph.book..193D Altcode:
An interferometer has been developed for inspecting large flat surfaces
by reference to small primary standard. In this interferometer, the
diffraction gratings are designed such that one is the replica of the
other and both are mirror gratings. The results are of interest in
connection with the development of solar telescopes.
---------------------------------------------------------
Title: A Study of the Birefringent Polymers on the Spectrocompensator
Authors: Demidov, M. L.; Skomorovsky, V. I.
1982IGAFS..60...71D Altcode:
No abstract at ADS
---------------------------------------------------------
Title: The SibIZMIR Halpha -cinematograph.
Authors: Banin, V. G.; Klevtsov, Yu. A.; Skomorovskij, V. I.; Trifonov,
V. D.
1982BSolD1982...90B Altcode:
No abstract at ADS
---------------------------------------------------------
Title: The Sibizmir Hα Cinematograph
Authors: Banin, V. G.; Klevtsov, Y. A.; Skomorovsky, V. I.; Trifonov,
V. D.
1982BSolD...1...90B Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Making and Investigation of the Large Solar Vacuum Telescope
Lsvt Objective
Authors: Domyshev, G. N.; Klevtsov, Y. A.; Skomorovsky, V. I.; Gan,
M. A.; Ustinov, V. I.
1982IGAFS..60..212D Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Monochromatic Filters for Solar Observations
Authors: Skomorovsky, V. I.; Ioffe, S. B.
1980IGAFS..52..128S Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Two-dimensional analysis of waveprocesses in the lower
chromosphere in the vicinity of an active region.
Authors: Larionov, N. V.; Merkulenko, V. E.; Polyakov, V. I.;
Skomorovskij, V. I.; Zhugzhda, Yu. D.
1979IGAFS..45...68L Altcode:
No abstract at ADS
---------------------------------------------------------
Title: An automatized solar telescope.
Authors: Osak, B. F.; Grigor'ev, V. M.; Kruglov, V. I.; Skomorovskij,
V. I.
1979nta..conf...84O Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Some results of a flare observation with the help of a filter
in the Hbeta line.
Authors: Merkulenko, V. E.; Polyakov, V. I.; Skomorovskij, V. I.
1979IGAFS..45...64M Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Devices for the control of astronomical optics.
Authors: Domyshev, G. N.; Kitov, A. K.; Sadokhin, V. P.; Skomorovskij,
V. I.
1979nta..conf..126D Altcode:
No abstract at ADS
---------------------------------------------------------
Title: A two-dimensional analysis of wave processes in the lower
chromosphere in the neighbourhood of an active region from filtergrams
in the Ba II 4554+0.05 Å line.
Authors: Polyakov, V. I.; Merkulenko, V. E.; Skomorovskij, V. I.;
Larionov, N. V.
1977BSolD1977...62P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Some results of a two- and three-dimensional spectral analysis
of wave processes in the lower chromosphere from filtergrams in the
Ba II 4554+0.05 Å line.
Authors: Larionov, N. V.; Merkulenko, V. E.; Polyakov, V. I.;
Skomorovskij, V. I.
1977IGAFS..42...50L Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Time variations of the chromospheric brightness structure
near an active region obtained from filtergrams of the line Ba II
4554+0.05 Å.
Authors: Larionov, N. V.; Merkulenko, V. E.; Polyakov, V. I.;
Skomorovskij, V. I.
1977BSolD1976...84L Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Preliminary results of chromospheric observations with the
birefringent filter in the lines Ba II 4554 and Hbeta 4861 Å.
Authors: Skomorovskij, V. I.; Merkulenko, V. E.; Polyakov, V. I.
1976BSolD1976R..73S Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Time variations of the brightness of the chromospheric
structure using filtergrams in the Ba II 4554+0.05 Å line.
Authors: Larionov, N. V.; Merkulenko, V. E.; Polyakov, V. I.;
Skomorovskij, V. I.
1976BSolD1976...78L Altcode:
No abstract at ADS
---------------------------------------------------------
Title: An analysis of the brightness of a plage and surrounding
chromospheric elements from filtergrams in the Ba II 4554±0.05
Å line.
Authors: Kuklin, G. V.; Merkulenko, V. E.; Polyakov, V. I.;
Skomorovskij, V. I.
1976eear.conf...76K Altcode:
No abstract at ADS
---------------------------------------------------------
Title: On brightness variations of "rosettes" of the chromospheric
network in the wings of the Halpha line.
Authors: Polyakov, V. I.; Skomorovskij, V. I.; Merkulenko, V. E.
1976opa..conf....6P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Brightness variations of chromospheric mottles in the
neighbourhood of an active region from filtergrams in the Halpha
+0.5 Å line.
Authors: Polyakov, V. I.; Merkulenko, V. E.; Skomorovskij, V. I.
1975IGAFS..37...55P Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Control of the transparence of a multi-layer dielectric system
in the process of vacuum evaporation.
Authors: Aleksandrovich, S. V.; Kobanov, N. I.; Osak, B. F.; Parfenova,
R. I.; Skomorovskij, V. I.
1975IGAFS..37..243A Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Narrow-band interference-polarization filter with two
transmission bands.
Authors: Aleksandrovich, S. V.; Domyshev, G. N.; Korovkin, A. I.;
Sadokhin, V. P.; Skomorovskij, V. I.
1975NTvA....5...34A Altcode:
No abstract at ADS
---------------------------------------------------------
Title: On the brightness fluctuation of coarse mottles of the
chromospheric network in a line.
Authors: Merkulenko, V. E.; Polyakov, V. I.; Skomorovskij, V. I.
1974IGAFS..31...13M Altcode:
No abstract at ADS
---------------------------------------------------------
Title: A preliminary model of the magnetic field structure of a
coarse mottle of the chromospheric network.
Authors: Merkulenko, V. E.; Polyakov, V. I.; Skomorovskij, V. I.
1974IGAFS..31...92M Altcode:
No abstract at ADS
---------------------------------------------------------
Title: Checking up cristal elements in birefringent filters (IPF).
Authors: Skomorovskij, V. I.
1973IGAFS..26..210S Altcode:
No abstract at ADS
