Effects of turbulence on the electron cyclotron-maser mechanism for solar microwave spike bursts

Details Effects of turbulence on the electron cyclotron-maser mechanism for solar microwave spike bursts Effects of turbulence on the electron cyclotron-maser mechanism for solar microwave spike bursts

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991soph..136..343r&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 136, Dec. 1991, p. 343-360. Research supported by Australian Research Council.

Physics

15

Electron Cyclotron Heating, Maser Outputs, Microwave Emission, Solar Radio Bursts, Turbulence Effects, Perturbation Theory, Solar Corona, Solar Flares, Solar X-Rays

Scientific paper

Attention is given to the significant effects that field perturbations of the few-percent magnitude seen in flaring loops can have on the processes involved in the electron cyclotron maser model of the solar microwave spike bursts. It is shown that growth lengths are increased, absorption depths decreased, mode conversion becomes more effective, and turbulent refraction leads to isotropization of the emission. The criteria for significant effects to occur are derived and it is shown that they can be met by the few-percent field perturbations in coronal loops. Relative to the theory of cyclotron-maser emission in smoothly varying plasmas, perturbations enable fundamental o-mode (o1) and second-harmonic x-mode (x2) radiation to saturate more effectively, increase the change of x1, o1, and x2 radiation escaping to infinity through absorption and mode-coupling windows, and partially isotropize radiation emitted near the x-mode cutoff. It is concluded that o1 and x1 emission are both likely to be present, and that x2 emission is possible under some circumstances.

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