Emission of Solar Radio Spikes by Beam-Driven Cyclotron Resonance

Details Emission of Solar Radio Spikes by Beam-Driven Cyclotron Resonance Emission of Solar Radio Spikes by Beam-Driven Cyclotron Resonance

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996soph..168..171t&link_type=abstract

Solar Physics, Volume 168, Issue 1, pp.171-182

Physics

2

Scientific paper

The generation of bright solar radio spikes by the beam-driven cyclotron resonance maser mechanism (the resonant interaction of an electron beam with a circularly polarized wave in a background plasma under the action of a guide magnetic field) is studied. Nonlinear effects such as radiation damping and gyrophase bunching on electron energy and momentum are responsible for the enhanced direct energy conversion between the beam and the coherent wave. Factors such as beam energy spread and pitch angle distribution are analyzed. The intense maser radiation is carried at the source by the circularly polarized wave propagating along the magnetic field. Due to the magnetic field curvature, the outgoing maser radiation converts into extraordinary and ordinary modes. The extraordinary mode suffers from plasma absorption at the second harmonic layer, whereas the ordinary mode is likely to get through.

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