Superfine time structure in solar radio flares as a reflection of electron beam gyrosynchrotron instability

Details Superfine time structure in solar radio flares as a reflection of electron beam gyrosynchrotron instability Superfine time structure in solar radio flares as a reflection of electron beam gyrosynchrotron instability

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995azh....72..911m&link_type=abstract

Astronomicheskij Zhurnal, vol. 72, p. 911

Astronomy and Astrophysics

Astronomy

1

Solar Radio Emission, Electron Beams, Solar Flares, Fine Structure, Cold Plasmas, Magnetohydrodynamic Stability, Solar Electrons, Absorption Spectra, Synchrotron Radiation, Plasma Waves

Scientific paper

An interpretation of the fine-time-structure flare microwave radio emission of the sun using a gyrosynchrotron maser mechanism is presented. Values are obtained for the absorption and emission coefficients of ordinary and extraordinary waves in cold magnetoactive plasma with Gaussian electron beams of moderate relativistic energy. It is shown that, at discrete narrow-band frequencies, the absorption coefficient is negative right up to the seventh gyrofrequency harmonic for observing angles greater than 70 deg; i.e., gyrosynchrotron instability arises, leading to a maser mechanism and emission from extraordinary waves in the plasma. The frequency range for ordinary waves is narrower and limited to the first three harmonics. The amplification coefficients of the radiation are 10 exp 3 and higher, which can explain the brightness temperatures in individual spikes (10 exp 13 K and higher). Nonlinear relaxation of the beam of fast electrons determines the saturation of the gyrosynchrotron maser and, consequently, the duration of an individual spike.

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