Statistics – Computation
Scientific paper
Nov 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995stin...9624197t&link_type=abstract
Technical Report, Academy of Sciences (USSR) Moscow, USSR General Physics Inst.
Statistics
Computation
Radiation Transport, Space Plasmas, Radiation Effects, Plasma Frequencies, Electromagnetic Scattering, Computational Astrophysics, Supernova Remnants, Accretion Disks, Solar Radiation, Photons
Scientific paper
Collective plasma effects are considered in the scattering of radiation in astrophysical plasmas. They appear to be important over a broad range of frequencies omegape less than omega less than omegape c/vTe (omegape is the plasma frequency, c is the light velocity, and vTe is the electron thermal velocity). The contribution to the radiative transport due to collective scattering in the plasmas and a generalization of Kompaneets equation are found. Both the stimulated and spontaneous scattering and the contribution of scattering on electrons and ions are taken into account. In the transport cross-sections the scattering on ions starts to contribute for omega less than or equal to 3 omegape c/vTe while in the generalized Kompaneets equation the scattering on ions dominate for omega less than or equal to omegape(c/vTe)(me/mi)1/4. It is shown that the contribution related to the change of frequency during the stimulated and spontaneous scattering, modifies the structure of the transport equation. We show that this new transport equation contains a derivative of the intensity with respect to the frequency and in general such an equation does not allow the use of the concept of opacity as normally defined. Application of the results of collective scattering of radiation in accretion discs, supernova remnants, and solar radiation transport is discussed.
Bingham Richard
Deangelis U.
Forlani A.
Tsytovich Vadim N.
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