Thermal Correction to the Rate of Second Harmonic Plasma Emission

Details Thermal Correction to the Rate of Second Harmonic Plasma Emission Thermal Correction to the Rate of Second Harmonic Plasma Emission

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh11b1662l&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SH11B-1662

Physics

Plasma Physics

[7534] Solar Physics, Astrophysics, And Astronomy / Radio Emissions, [7827] Space Plasma Physics / Kinetic And Mhd Theory, [7868] Space Plasma Physics / Wave/Wave Interactions

Scientific paper

Radio emissions at multiples of the local plasma frequency fp, often termed “plasma emissions”, are generated in various regions of our solar system including the solar corona, the interplanetary medium, Earth's foreshock, and the outer heliosphere. The prevailing theory of plasma emission involves nonlinear interactions between three plasma wave modes: ion sound waves, free-space transverse waves, and Langmuir waves (which have frequency close to fp). In this theory, second harmonic (2fp) emission is generated by the coalescence of two Langmuir waves to give a free-space electromagnetic transverse wave. Three-wave interactions such as this are described by the quadratic response tensor, which can be used to calculate the interaction rate. Until now, the Langmuir-wave coalescence process has been treated using the cold-plasma quadratic response tensor, in which thermal effects are neglected in the wave coupling. For the first time, we present a thermal correction to the cold-plasma quadratic response tensor. The new expression for the thermal correction is valid for any particle velocity distribution. Applying the thermal correction to the Langmuir-wave coalescence process leads to a substantially enhanced interaction rate when the speed of the electron beam driving the Langmuir waves is a few times the electron thermal speed.

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