On the electron-cyclotron maser instability. I - Quasi-linear diffusion in the loss cone. II - Pulsations in the quasi-stationary state

Details On the electron-cyclotron maser instability. I - Quasi-linear diffusion in the loss cone. II - Pulsations in the quasi-stationary state On the electron-cyclotron maser instability. I - Quasi-linear diffusion in the loss cone. II - Pulsations in the quasi-stationary state

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...332..447a&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 332, Sept. 1, 1988, p. 447-475.

Astronomy and Astrophysics

Astrophysics

46

Electron Cyclotron Heating, Magnetohydrodynamic Stability, Microwave Emission, Quasi-Steady States, Solar Radio Emission, Decimeter Waves, Masers, Particle Density (Concentration), Plasma Diffusion

Scientific paper

Emission and quasi-linear velocity diffusion by the electron-cyclotron maser instability are studied under conditions of continuous operation. For the first time, the maser-induced quasi-linear diffusion is computed with the same accuracy as the well-known linear growth rates, including integration along the actual resonance space in k-space. This permits the feedback of the emission on the particle distribution to be quantified. A novel result is the discovery of relatively long diffusion time scales for typical solar conditions. Oscillations set up by small disturbances around the steady state are considered. Periods in the limit of small amplitude of the self-organizing wave-particle system are investigated for the magnetoionic X- and O-mode and for harmonic numbers s = 1, 2 of the maser instability. Pulsation periods in the order of 1 s, as observed in the decimetric range of solar flare emission, are found to exist for fundamental O-mode and for harmonic X-mode.

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