Evolution of the axial electron cyclotron maser instability, with applications to solar microwave spikes

Details Evolution of the axial electron cyclotron maser instability, with applications to solar microwave spikes Evolution of the axial electron cyclotron maser instability, with applications to solar microwave spikes

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...322..463v&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 322, Nov. 1, 1987, p. 463-472.

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3

Electron Cyclotron Heating, Interstellar Masers, Magnetohydrodynamic Stability, Solar Radio Emission, Magnetic Field Configurations, Plasma-Particle Interactions, Solar Flares

Scientific paper

The nonlinear evolution of cyclotron radiation from streaming and gyrating electrons in an external magnetic field is analyzed. The nonlinear dynamics of both the fields and the particles are treated fully relativistically and self-consistently. The model includes a background plasma and electrostatic effects. The analytical and numerical results show that a substantial portion of the beam particle energy can be converted to electromagnetic wave energy at frequencies far above the electron cyclotron frequency. In general, the excited radiation can propagate parallel to the magnetic field and, hence, escape gyrothermal absorption at higher cyclotron harmonics. The high-frequency Doppler-shifted cyclotron instability can have saturation efficiencies far higher than those associated with well-known instabilities of the electron cyclotron maser type. Although the analysis is general, the possibility of using this model to explain the intense radio emission observed from the sun is explored in detail.

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