Nongravitational Effects on Cometary Motion due to Jupiter . ... The problem of linking cometary apparitions before and after the approach of a comet to Jupiter was investigated. A hypothesis of possible existence of additional acceleration, perturbing the motion of comets in the vicinity of Jupiter, was considered. This nongravitational perturbation is described by a function of the jovicentric distance, written in a standard "force law" form. ...

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... Future seminars . P a s t seminars . ... E.G. Berezhko (Yu.G.Shafer Institute of Cosmophysical Research and Aeronomy) . ... CR acceleration (generation) at the shocks, produced by supernova explosions, and the properties of nonthermal emission generated by CRs accelerated in supernova remnants are detaily discussed. ... Due to magnetic field amplification CR acceleration in supernova remnants provide the formation of the observed galactic CR spectrum up to the energy 10**17 eV. ...

... By the time Isaac Newton entered college, the scientific revolution of the 17th century was well underway. ... Men like Copernicus, Kepler, Galileo, and Descartes had all helped develop a new view of nature. ... Plato is my friend, Aristotle is my friend, but my best friend is truth." ... Isaac Newton was born on Christmas Day, 1642, the same year Galileo died. ... He was one of the most creative geniuses the world has ever seen and to many people the greatest scientist who ever lived. ...

Blackholes2 Forum Message . Forums: . Atm ћ Astrophotography ћ Blackholes ћ Blackholes2 ћ CCD ћ Celestron ћ Domes ћ Education . ... Post . ... Could This Be Considered The .. ... Post Message | ... www.astronomy.net . About Astronomy Net | ... Unless otherwise specified, web site content Copyright 1994-2016 John Huggins All Rights Reserved . Forum posts are Copyright their authors as specified in the heading above the post. "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...

... Hide Zen home . ... GIN . ... contains: value_array @ query_array . ... An example for a Gin opclass can be found in ginarayproc.c. Datum * extractValue( Datum inputValue, uint32* nentries) Returns an array of Datum of entries of the value to be indexed. nentries should contain the number of returned entries . int compareEntry( Datum a, Datum b) Compares two entries (not the indexing values) Datum * extractQuery( Datum query , uint32* nentries, StrategyNumber n) Returns an ...

The ion rocket is another means of providing thrust, more gradually but also more efficiently than a conventional rocket. ... As in the nuclear rocket, the energy which propels the xenon jet comes from a different source; here it is electrical energy from solar cells. The reason an ion rocket is much more efficient than ordinary rockets is the way its jet is produced. ... As with solar sails, solar ion engines are mainly practical in the inner solar system, where ample sunlight is available. ...

... What is a pulsar? ... For young pulsars with superstrong magnetic fields ( ) and hot polar caps (with temperature of ), because of the energy loss of electrons or positrons due to resonant inverse Compton scattering in the vicinity of polar caps, pair cascades occur at distances further away from the polar cap, and in this case, we have a relatively high acceleration efficiency with ions carrying most of the particle luminosity. ... Limits on particle energies by resonant inverse Compton scattering ...

Next: Scattering properties Up: Polarization properties (transmitted radiation) Previous: Linear polarization: wavelength dependence . Traditionally, the main problem considered in connection with circular interstellar polarization is the meaning of the wavelength where changes the sign . ... This is also demonstrated by Fig. 19 (lower panel) which shows the wavelength dependence of the factors of linear and circular polarization for particles of magnetite as was done by Shapiro ([ 1975 ]). ...

... Planets . ... An artistтАЩs impression of Ceres located in the asteroid belt, with plumes of water vapour rising from its surface. Could Ceres have more water than on Earth? (image credit: ESA/ATG medialab) . ... Ceres, captured by the Dawn Space craft in December 2014, Dawn was 740,000 miles (1.2 million km) from Ceres at the time. (image credit: NASA/JPL-Caltech/UCLA/MPS/DLR/IDA) . ... Now itтАЩs a dwarf planet. (image credit: NASA/ESA/SWRI/Cornell University/University of Maryland/STSci) . ...

... stars . ... Could gas giants be considered stars that failed to ignite? ... The distinction between gas giant planets and brown dwarfs ("failed stars") is a vague one. ... It depends on what gas giant youт??re looking at and how you distinguish a т??planetт?? from a т??failed star.т?? A gas giant found in orbit around a star might be considered a planet like Jupiter around the Sun. An isolated gas giant is probably a failed star. ... Get instant access to subscriber content on Astronomy.com! ...

... Binary orbits in the acceleration/period plane . Circular Orbits . ... We first present the equations for the period and acceleration of a pulsar in an eccentric binary system as a function of its position in the orbit. ... In Freire, Kramer & Lyne (2001) (from where most of this text and following equations are taken), we describe in more detail how circular binary orbits can be determined from the observed periods and accelerations of the pulsar. ... where is the orbital period of the binary. ...

Solar Flare Origin - critical analysis" Lev Pusti'lnik We analyze current approach to solar flare origin in 3 aspects: a. Pre-flare equilibrium state of current-magnetic structure above active region and its evolution to flare state, b. Possible reasons of stability loss with transition of system in flare state c. Flare energy release in turbulent current sheet and particle acceleration in this system. ...

We present and discuss the results of new multiple-scattering radiative transfer calculations for three representative types of galactic environments, filled with either homogeneous or two-phase clumpy dust distributions. ... The examination of the models concentrates on the study of UV/visual/near-IR reddening effects, the wavelength dependence of attenuation, and on the changes that arise from the transition from homogeneous to clumpy dust distributions in different star/dust geometries. ...

... Line radiative transfer in C 18 O, HCO + , and CS lines is considered in a spherically symmetric chemo-dynamical model of a starless core, evolution of which is driven by the ambipolar diffusion. Theoretical line profiles are compared to observational data on the well-known L1544 core, which is one of possible candidates for collapsing protostellar clouds. ... Comparison between modelled and observed spectra suggests that L1544 has flattened structure and is observed at some inclination. ...

Electromagnetic burst shape from collapsing magnetized object", Pis'ma v AZh, submitted, 1996 . ... The shape of magneto-dipole losses is investigated taking into account the relativistic effect of magnetic field dissipation in the result of the collapse. In terms of the simple model the solution of the burst like type has been obtained both for a direct collapse and for a case of formation of a fast-roating, self-gravitating object colled spinar. ... Photos Galya Lipunova ( galja@sai.msu.ru ) . ...

Chair of solid state physics . ... The Physics of Phonons . ... In the first part of the course “The Physics of Phonons” the dynamics of atoms in one- and three- dimensional crystalline lattices is considered in detail. The quasiparticle conception in solids, taking phonons as an example, is discussed; creation and annihilation operators of phonons, main properties of acoustic and optical phonons dispersion laws, density of phonon states. ... Crystalline state. ... Acoustic and optical phonons. ...

... Russian KOI8 . ... Radio galaxies and cosmology [in Russian]) . ... The book is devoted to investigations of powerful radio galaxies in the different wavelength ranges. ... The history of study for radio galaxies is given and the outlook on radio galaxy exploring is considered. ... The cosmological tests to check the Universe evolution parameters constructed on the observational data of radio galaxies are considered in details. ... List of detected misprints (in Russian). ...

... Head of the seminar: Prof. B.V. Somov, . ... The seminar considers the questions related to generation of magnetic fields in astrophysical plasmas, effect of the magnetic reconnection and particle acceleration in strong magnetic fields, the origin and propagation of cosmic rays, the flares and other non-stationary phenomena in the solar atmosphere and solar wind, Sun Earth connections and physical processes in the heliosphere. ... On the Topological Models and Topological Trigger of the Solar Flares...

... ЭКСПЕРИМЕНТ "STROMA" . ... Stroma Biocontainers (10); . ... Investigate the bone marrow stromal cell differentiation and mesenchymal tissue reconstruction in microgravity. ... Assess the microgravity effects on mesenchymal Bone Marrow Stromal Cells. EXPERIMENT RESULTS: Biology containers (10) returned to the ground. ... This experiment will assess the microgravity effects on mesenchymal Bone Marrow Stromal Cells, which contain a very active fraction of multipotents bone-cells precursors. ...