The Solar spots - are the dark formations on the Sun's disk. ... The greatest observed spot is 100 thousand kilomiters. The spots are the places of the magnetic fields' getting out to the solar atmosphere. ... That's why they look so dark . ... The Solar convection zone is the layer with the thickness of 150 - 200 thousand kilomiters, situated under the photosphere; the substance of this layer being in convectional movement transformes the energy from inside the Sun's to its surface. ...

. Dr. Michael G. Gavrilov, Founding Chairman and Coordinator of the Asian-Pacific Astronomy Olympiad (APAO) . ISSP of Russ. Acad. Sci., Institute street 2, 142432 Chernogolovka, Moscow region, Russia. URL: http://www.issp.ac.ru/iao/apao/2009/ . e-mail: gavrilov@issp.ac.ru . fax: + 7-(496-52)-49-701 .

... Astrophysics Group . ... Exploring the Cosmic Dawn . ... Cosmic reionization corresponds to the epoch in which the first stars€а and black holes reionize the neutral intergalactic medium (IGM) that€аpervades the Universe following recombination, within a few hundred€аmillion years of the Big Bang. The epoch of reionization, and the€аpreceding ?dark ages? prior to the formation of the first stars,€аrepresent the last unexplored phases of cosmic evolution to be tested€аand explored. ...

Class 1 Introduction, Background History of Modern Astronomy The Night Sky, Eclipses and the Seasons Kepler's Laws Newtonian Gravity General Relativity Matter and Light Telescopes Class 2 Solar System Characteristics Formation Exosolar Planets Class 3 Stars The S un Stellar Evolution of Low and High Mass Stars Deaths of Stars Exotic Stars Class 4 Galaxies Galaxy Classification Formation of Galaxies Galactic ... Low mass stars live and die differently than high mass stars. ...

EVOLUTION OF GALACTIC DISCS: TWO MODES OF STAR FORMATION ABSTRACT We develop the model of the evolution of surface gas density, stellar density, star formation rates and chemical composition of galactic disc taking into account the gravitational instability of rotating gaseous layer in the scales of several kpc. ... In the model we took into account the gas return from evolved stars, a radial movement of the gas in a spiral arms and accretion of the gas into the galactic disc. ...

Hourly values of parameter foF2 (F2 layer critical frequency) The description of letters in the tables of parameter foF2 A blanketing. ... C non-ionospheric (equipment). D above upper frequency range of equipment. E below lower frequency range of equipment. F frequency spread. ... K particle E layer. L no sufficiently defined cusp between F layers. ... N superimposed layers. O measurement refers to o component. ... Q range spread. R attenuation near critical frequency. ...

Comets as the Object of Investigation. ... Stratification of Comets Atmospheres and Their Chemical Structure. ... Formation and Change of Surface Dust Layer of Periodical Comets' Nucleas and Their Evolution in Solar Radiation Field. ... Dynamics of Matter in Near-Nuclear Region of Comet Atmosphere in Adiabatic Approximation. ... Kinetic Theory of Gas Stream in Region of Transition between Condition of Continuum to Free-Moleculte Stream. ... Free-Moleculte Stream of Neutral Gas in Comet Atmosphere. ...

... SOLAR FLARES . Reconnection of magnetic fields of the moving magnetic structures at the Sun surface results in formation of current layers and generation of plasma waves. Electrons and photons are accelerated by the electrostatic fields and the plasma waves to energies of hundreds and thousands MeV. ... accelerated charged particles generate the high energy photons. ... Schematic model of the solar flare. table of contents . previous page . next page . ... CYGAM (PDF, 450 Kb) . ...

... We have assumed a constant in time star formation rate and the total number of stars in the Galaxy, , to be such that the total mass of the galaxy is ; assuming the Salpeter mass function   , we get . ... This number agrees with a standard estimation of the galactic star formation rate of order of per year. In each run of calculations, we trace the evolution of binaries with initial parameters randomly distributed according to the chosen initial laws. ...

... Posts tagged ?star formation? ... Star Formation via the Little Guy: A Bayesian Study of Ultracool Dwarf Imaging Surveys for Companions by P. R. Allen. ... ArXiv] Bayesian Star Formation Study, July 13, 2007? ... Algorithms arXiv Astro Bad AstroStat Bayesian CHASC Cross-Cultural Data Processing Fitting Frequentist Galaxies gamma-ray High-Energy Imaging Jargon Job Languages MC MCMC Meta Methods Misc News Nuggets Objects Optical Physics Quotes Spectral Stars Stat Timing Uncertainty X-ray . ...

Find Similar Abstracts (with default settings below ) . ... Translate Abstract . ... Bispectrum speckle interferometry and future long-baseline interferometry of the carbon star IRC+10216 . ... 2003SPIE.4838.1055B We present near-infrared (JHK) bispectrum speckle-interferometry monitoring of IRC+10216 obtained with the SAO 6m telescope. The present speckle observations covering baselines up to 6m provide important complementary informations for future long-baseline interferometry. ...

... Tonight's Sky . ... The Magazine . ... Observing . ... Magazine . ... The double star 54 Leonis, spiral galaxy NGC 3198, and emission nebula NGC 3199 . ... Astronomy for Kids . ... Animations of icy planet formation . ... Quicktime animations illustrate the evolution of bright rings of dust in a disk where icy planets form.. Get instant access to subscriber content on Astronomy.com! ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ...

... 2000: . It is shown that radio emission of microbursts in solar active regions is the manifestation of noise storms at the fundamental plasma frequency, and is the result of instabilities propagating at the tops of coronal loops. ... Collaboration with the Nancay Decimetric Radio Telescope (France). A method for determining the height of the corona base above sunspots was proposed. ... Archive . ...

... The star formation rate (SFR) of the current SF episode can be estimated from the total H luminosity. ... For the derived total flux F (H )=5.8 erg s -1 cm -2 we obtain a total H luminosity of 10 39 erg s -1 . ... The total mass of ionized gas can be obtained from the average mass density inside the H II region and its volume. An average mass density corresponding to the average electron density of 1 cm -3 within a volume with a diameter of 0.5 kpc yields a total ionized gas mass of 10 6 . ...

... Ciel Espace, le magazine qui vous guide toujours plus loin . ... des pages consacr†йes †а la publication de vos photos Mais c'est aussi une vraie communaut†й avec laquelle partager votre passion et nourrir votre curiosit†й. Accueil Une exoplan†иte en formation d†йfie la th†йorie . ... Avec Hubble, des astronomes ont d†йcouvert ce qui semble †кtre une plan†иte en formation situ†йe aux confins du syst†иme qui l'abrite. ... 29/02/2016 - Neuvi†иme plan†иte : une †йquipe fran†зaise indique o†µ chercher ....

... 2, JUNE 2003 1039 Properties of a High-Tc dc SQUID Radiofrequency Amplifier Alexey S. Kalaboukhov, Michael A. Tarasov, Ants Lohmus, Zdravko G. Ivanov, and Oleg V. Snigirev Abstract--We present an experimental investigation of a radiofrequency amplifier based on a bicrystal high- dc SQUID designed for the frequency range 500­3000 MHz. ... Maximum power gain was found to be 16 dB at 520 MHz for a SQUID with 8 turn input coil. ... Digital Object Identifier 10.1109/TASC.2003.814145 T Fig. ...

... The Russian TESIS/ CORONAS-PHOTON Solar Observatory, which has been working in orbit since January 30th, 2009, has photographed one of the most important events in the build up to the upcoming solar cycle - the formation of our star's new southern belt of activity. The first magnetic fields of the new cycle in the southern hemisphere appeared on the Sun's surface on May 23-24th. ... The belt of activity is one of the primary concepts, characterizing the solar cycle. ...

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Surface-layer turbulence measurements with lunar scintillometer Idea of the method Hardware & software Campaigns & results New horizons Andrei Tokovinin NOAO/CTIO Kislovodsk Oct. 2010 1 Turbulence measurement from scintillation of extended sources Moon's angular diameter =0.5 deg Correlated scintillation for b > z z=10m b=0.1m z=100m b=1m z=10km b=100m BI(b) = W(b,z) Cn2(z)dz Weighting functions zW(z) for b=0...0.4m and d=1cm 2 Kislovodsk Oct. ... 2010 12 Paranal: October 14, 2008 Kislovodsk Oct. ...

. Andrey Kravtsov "High-Resolution Cosmological Simulations of Cluster Formation" . < FIRST ] [ PREVIOUS ] [ MAIN . Slide 17 (of 17) .