Subject, Problems and Objects of Theoretical Astrophysics. ... Stellar Photospheres, Their Features. ... Physics of Continuous Radiation Absorption in Stellar Photospheres. ... Continuous Radiation Absorption in Stellar Photospheres of Various Spectral Classes. Solar Type Photospheres. ... Characterisics of Absorption Lines. ... Interstellar Absorption Lines, Their Features. ... Physical and Dynamic Features of Interstellar Medium, Which Follows from Observations of Interstellar Absorption Lines. ...

... The Sun is the closest star to us, and a regular object in our Galaxy. Solar activity manifests itself, primarily, in solar flares - episodic explosive energy release in the form of electromagnetic radiation and high energy particles (electrons and protons). The nature of the flares is related to cyclic variations of global and local magnetic fields in the atmosphere of the Sun. ... Such formations are called active regions. ...

... Sunspots . ... Solar cycle . ... Solar Corona . Solar magnetic fields . Solar wind and heliosphere . ... webmaster@izmiran.ru . ... M.A.Livshits, V.N.Obridko, S.B.Pikel'ner . Radio emission and atmospheric structure above sunspots . AZh (Soviet Astronomy), 1967, v. 10, no. 6, pp. ... V.N.Obridko . On the two-component structure of the sunspot magnetic field . ... On the two-component sunspot model . ... V.N.Obridko, L.B.Demkina . ... Solar Physics, 1972, v.24, No.2, 336 - 341. ...

Refinements on precession, Nutation , and Wobble of the Earth VИronique Dehant, Royal Observatory of Belgium ROB rigid Earth nutation Forced Nutations oceanic/atmospheric corrections Non-rigid Earth nutation model Earth response comparison with observation Earth interior model ROB Earth rotation changes due to the core ; core - mantle coupling coupling mechanisms: topographic ...

WFPC2 . Images: version1 , version2 . Catalogs: Version 1 HDF-S , HDF-N ;Version 2 HDF-S . STIS . ... NICMOS . Images: Camera 3 , V2 of psf-convolved STIS 50CCD on NICMOS . ... Images: WFPC2 FF , STIS FF ; Version2: WFPC2 FF , STIS FF , NICMOS FF . Catalogs: Version2 WFPC2 FF , STIS FF , NICMOS FF . ... Check the instrument specific technical pages for a description of the data products and the implemented data reduction steps: STIS , WFPC2 , NICMOS , Flanking Fields . ...

CHIANTI - an atomic database for emission lines. ... K.P.Dere, E.Landi, H.E.Mason, B.C.Monsignori-Fossi, P.R.Young, 1997, A , 125, 149 . Article: Available from ADS . The Arcetri Spectral Code for thin plasmas . E.Landi M.Landini 1998, A , 133, 1 . ... E.Landi, M.Landini K.P.Dere, P.R.Young, H.E.Mason, 1999, A , 135, 339 . ... K.P.Dere, E.Landi, P.R.Young, G.Del Zanna, 2001, ApJS, 134, 331 . ... G.Del Zanna, B.J.I.Bromage, E.Landi, M.Landini, 2001, A , 379, 708 . ...

The large magnetic cloud caused by coronal mass ejection at the Sun on January 6, 1997 came to the Earth at early morning on January 10 and continue to interact with Earth's magnetosphere till January 11 (see for example home page of this event prepeared by Dr. M.Peredo http://www-istp.gsfc.nasa.gov/istp/cloud_jan97/event.html ). ... During the days discussed here INTERBALL-1 satellite was in the magnetosphere (MS) near its dusk flunk - see the Fig. 1 for compearing. ...

... This study reveals for the first time the existence of bi-directional jets, which are a signature of magnetic reconnection, occurring along coronal hole (CH) boundaries. ... K) emission lines in an equatorial extension of a polar coronal hole, known as the ``Elephant's Trunk'' coronal hole, show small regions of a few arc-seconds size with strong blue- and red-shifted emission reaching Doppler shifts of up to 150km s, i.e. bi-directional jets. ...

... The HST uses an onboard model of its orbit to perform in real-time various control functions relating to spacecraft operations and observation support. ... New coefficients for the ephemeris are updated every other day, and are archived as FITS keywords for each HST observation data set. Using these coefficients,an observer can perform a variety of calibration and characterization calculations relating to the orbital position and velocity of the telescope. ...

. A tree for site navigation will open here if you enable JavaScript in your browser. HOME . ABOUT ST-ECF . CONTACT . Maintained by Martin Kuemmel <mkuemmel@eso.org> .

The potential of masers to act as probes of their environment has long been recognised, but to date has proven very difficult to realise. ... 2001, Sutton et al. 2001). Masers are variable on timescales of weeks to months and one of the major limitations in previous attempts at multi-transition analysis has been the uncertainties introduced by combining observations made over many years using a variety of instruments with differing spectral and spatial resolutions and polarisation properties. ...

... Flux density at 1 GHz (/Jy): 210 . ... Optical: Large filamentary loop, brightest to the NE, not well defined to the S or W. X-ray: Shell in soft X-rays. ... DRAO at 408 MHz (3'.3?6'.7) for spectral index study, plus X-ray and optical. ADS . ... Optical spectroscopy of nearside filaments. ... 1992, ApJ, 400, 214. ... IRAS observations. ... Leahy et al. ... Far-UV spectroscopy, H and other optical observations of NE region. ... Suzaku observations of NE. ... Suzaku observations of N. ADS . ...

Peremennye Zvezdy ( Variable Stars ) 35 , No. ... We present the results of our new observations of QS Draconis, a recently discovered double-mode high-amplitude Scuti variable, HADS(B) type. ... Our CCD observations in the Johnson bands were performed at the Tien Shan Astronomical Observatory of the V.G. Fesenkov Astrophysical Institute, at the altitude of 2750 m above the sea level. ... The finding chart (Fig. 1) identifies the variable star, comparison star, and check star. ... Fig. ...

The space probes Pioneer 3 and 4 detected a wide belt of trapped particles beyond the inner belt. ... We now know that outer-belt ions and electrons probably come from the long "magnetic tail" of stretched field lines on the night side of the magnetosphere. Two radiation belts . ... When the outburst ends and the electric field dies away, the particles find themselves locked in trapped orbits of the ring current and the outer radiation belt. ... Exploration" home page (index) Glossary . ...

... To determine a lower limit to the sensitivity of current observations to measurements of NS surface temperatures, we have used data from the Einstein Slew Survey (Elvis et al. 1990) to establish temperature limits for 275 pulsars which received nonzero exposure during the survey. ... Filled squares correspond to pulsars actually detected in the survey data; the smaller symbols correspond to upper limits to the count rates. ... Click here for plot of x-ray data vs. cooling curves. ...

Archive of continuum observations consist of 140 magnetic tapes. From 1982 to 1987 only multi-frequency files were archived, which could be data-processed with old program PRF for SМ. Since 1991 new archive program ODA are used, 38 magnetic tapes were rewrited an DAT-tapes (since 1989). ... Now archive rewrite on DAT tapes every 1-2 weeks after observations. At last all archive of continuum observations has were writed on 12 CD-rom disks. Principal archivers: V.K. Kononov, S. Pavlov, ...

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Solar & Heliospheric Radiophysics of the Future T. S. Bastian NRAO · Science drivers · Observations & techniques · New instrumentation Science Issues (~10 yrs) · Magnetic energy storage and release flares and CMEs · Particle acceleration SEPs · Wave dissipation Corona/Chromosphere/Solar Wind · Space weather prediction from L. Lanzerotti Long duration flare observed on west limb by Yohkoh and the Nobeyama radioheliograph on 16 March 1993. ...

Abstract -- The strengths of magnetic fields in interstellar gas clouds are obtained through observations of the circular polarization of spectral line radiation. ... To infer information about these irregularities from the observational data, we develop statistical relationships between the rms values of the irregular component of the magnetic field and spatial variations in the circular polarization of the spectral line radiation. ...

... 81Trushkin+ The results of the multi-frequency radio observations of fourteen supernova remnants (SNRs) made with the RATAN-600 radio telescope in 1985 are reported. Flux densities of these SNRs are measured at least at two wavelengths: 31.3 and 7.6 cm. The radio spectra of some SNRs are precised. ... The radio sources detected inside or near the SNRs with the flux densities measured in the most sensitive 7.6-cm radiometer. The spectra of some point sources are discussed. ...