Nonlinear Saturation of Cyclotron Maser Instability Associated With Energetic Ring-beam Electrons

Details Nonlinear Saturation of Cyclotron Maser Instability Associated With Energetic Ring-beam Electrons Nonlinear Saturation of Cyclotron Maser Instability Associated With Energetic Ring-beam Electrons

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm11b1728l&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM11B-1728

Physics

Plasma Physics

[7534] Solar Physics, Astrophysics, And Astronomy / Radio Emissions, [7847] Space Plasma Physics / Radiation Processes, [7867] Space Plasma Physics / Wave/Particle Interactions

Scientific paper

The cyclotron maser instability (CMI) is a well known mechanism for the generation of radio waves. We present a series of two-dimensional simulation results associated with energetic ring-beam distributions in highly magnetized plasma to discuss the generation of the CMI waves. The results show new issues that we have overlooked in our previous study. First of all, in the presence of a pure or almost pure ring distribution CMI has high efficiency, but only the Z and X modes can be amplified effectively while the O mode is relatively much faint. Second, as the beam velocity of the ring-beam distribution increases, the two-stream instability becomes more active, and there are strong whistler waves with intensive electrostatic energy. Finally, after the settlement of the two stream instability in the ring-beam cases with fast beams, the X mode can still be amplified steadily without the interference of any mode competition.

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