Remarks on plasma emission and its application to solar radio bursts

Details Remarks on plasma emission and its application to solar radio bursts Remarks on plasma emission and its application to solar radio bursts

Mar 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978raf....20.1369m&link_type=abstract

(Radiofizika, vol. 20, no. 9, 1977, p. 1369-1378.) Radiophysics and Quantum Electronics, vol. 20, no. 9, Mar. 20, 1978, p. 945-9

Physics

Electrostatic Waves, Plasma Radiation, Solar Physics, Solar Radio Bursts, Anisotropic Media, Electron Density (Concentration), Ion Acoustic Waves, Magnetohydrodynamics, Optical Thickness, Plasma Turbulence, Propagation Velocity, Transverse Waves, Type 3 Bursts, Type 5 Bursts

Scientific paper

Three problems are considered which relate to the plasma emission mechanism; i.e., emission at the plasma frequency and its second harmonic due to Langmuir-wave conversion into transverse electromagnetic waves. The first problem involves practical difficulties attending the explanation of intense type III emission at the plasma frequency in terms of induced nonlinear Langmuir-wave scattering by thermal ions; the second deals with the generation mechanism for Langmuir waves; and the third concerns sources of Langmuir turbulence other than beam instabilities. Attention is given to the extremely high effective temperatures and optical depths observed to be characteristic of type III bursts at the plasma frequency. General formulas are presented for the Langmuir-wave increment characteristic of electrons with an anisotropic velocity distribution. It is shown that, as a rule, wave amplification is possible only for anisotropic velocity distributions having a discontinuity. Estimates are given for three specific types of anisotropy: that associated with a forward loss-cone distribution, that described by a Legendre polynomial, and that produced by a loss cone.

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