Collective plasma effects in scattering of radiation in astrophysical plasmas

Bingham, R. and Tsytovich, V. N. and de Angelis, U. and Forlani, A. and Mendonca, J. T. (2003) Collective plasma effects in scattering of radiation in astrophysical plasmas. Physics of Plasmas, 10 (8). pp. 3297-3308. ISSN 1070-664X (https://doi.org/10.1063/1.1588640)

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Abstract

The contribution to the radiative transport due to collective scattering in astrophysical plasmas and a generalization of the Kompaneets equation is obtained. Both the stimulated and spontaneous scattering and the contribution of scattering on electrons and ions are taken into account and shown to be important over a broad range of frequencies ωpe<ω<ωpec/vTe (ωpe is the plasma frequency, c is the light velocity and vTe is the electron thermal velocity). A new expression for the Eddington luminosity including collective effects is derived. In the transport cross section the scattering on ions starts to contribute for ω⩽3ωpec/vTe while in the generalized Kompaneets equation the scattering on ions dominate for ω⩽ωpe(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. A new transport equation is derived which 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.

  • Item type:Article
    ID code:52455
    Dates:
    Date
    Event
    2003
    Published
    18 July 2003
    Published Online
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:01 Apr 2015 15:45
    Last modified:23 Jun 2024 07:45
    URI:https://strathprints.strath.ac.uk/id/eprint/52455
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