Langmuir waves from trapped superthermal electrons

Details Langmuir waves from trapped superthermal electrons Langmuir waves from trapped superthermal electrons

Sep 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...296..278w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 296, Sept. 1, 1985, p. 278-286.

Astronomy and Astrophysics

Astrophysics

8

Electrostatic Waves, Solar Corona, Solar Electrons, Solar Radio Emission, Cerenkov Radiation, Gyrofrequency, Harmonic Radiation, Microwave Emission

Scientific paper

A 'gap' distribution of trapped superthermal but nonrelativistic electrons may generate Langmuir waves with a high brightness temperature 1/2 mc-squared, which has been invoked to explain the solar type I radio continuum. The conditions under which the Langmuir waves can actually become this intense when the electrons are treated as magnetized with a gyrofrequency smaller than the plasma frequency are evaluated. For isotropic electrons at a single velocity, there arise many instabilities, but most disappear for a slightly broadened velocity distribution. A serious Cerenkov instability, equivalent to the two-stream instability, occurs for electrons of small pitch angles. It is avoided by a modest loss cone. Then the Langmuir waves within 45 deg of the magnetic field can indeed achieve the expected high brightness temperature. The solar type I radio continuum can be explained in terms of a nonrelativistic electron gap distribution. Superthermal microwave gyroradiation implies sufficient superthermal electrons that their Langmuir waves might cause observable microwave emission at twice the plasma frequency.

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