### Abstract

Original language | English |
---|---|

Pages (from-to) | 3297-3308 |

Number of pages | 12 |

Journal | Physics of Plasmas |

Volume | 10 |

Issue number | 8 |

Early online date | 18 Jul 2003 |

DOIs | |

Publication status | Published - 2003 |

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### Keywords

- stimulated scattering
- astrophysical plasma
- plasma effects
- ion scattering

### Cite this

*Physics of Plasmas*,

*10*(8), 3297-3308. https://doi.org/10.1063/1.1588640

}

*Physics of Plasmas*, vol. 10, no. 8, pp. 3297-3308. https://doi.org/10.1063/1.1588640

**Collective plasma effects in scattering of radiation in astrophysical plasmas.** / Bingham, R.; Tsytovich, V. N.; de Angelis, U.; Forlani, A.; Mendonca, J. T.

Research output: Contribution to journal › Article

TY - JOUR

T1 - Collective plasma effects in scattering of radiation in astrophysical plasmas

AU - Bingham, R.

AU - Tsytovich, V. N.

AU - de Angelis, U.

AU - Forlani, A.

AU - Mendonca, J. T.

PY - 2003

Y1 - 2003

N2 - 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.

AB - 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.

KW - stimulated scattering

KW - astrophysical plasma

KW - plasma effects

KW - ion scattering

U2 - 10.1063/1.1588640

DO - 10.1063/1.1588640

M3 - Article

VL - 10

SP - 3297

EP - 3308

JO - Physics of Plasmas

JF - Physics of Plasmas

SN - 1070-664X

IS - 8

ER -