Direct generation of solar and stellar radio bursts by energetic electron maser

Details Direct generation of solar and stellar radio bursts by energetic electron maser Direct generation of solar and stellar radio bursts by energetic electron maser

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987soph..111..201l&link_type=abstract

(Observatoire de Paris, CNRS, CNES, et al., CESRA Workshop on Particle Acceleration and Trapping in Solar Flares, 2nd, Aubigny-s

Physics

12

Cyclotron Radiation, High Energy Electrons, Masers, Solar Radio Bursts, Stellar Radiation, Distribution Functions, Harmonic Radiation

Scientific paper

A fully relativistic electron maser is proposed for the explanation of certain nonthermal solar and stellar radio bursts. This mechanism (maser synchrotron) is based on a gyroresonant interaction between waves and electrons of high energies and uses the free energy contained in an electronic distribution function that peaks for energies around 1 MeV. By a calculation of the growth rates of the three electromagnetic modes, it is shown that the X-mode prevails for values of omega(p)/omega(c) up to 2 or 3. This result is very different from the standard cyclotron maser case where such values of omega(p)/omega(c) lead to quench the X-mode growth. Hence, the synchrotron maser instability appears to be a direct and efficient amplification process for considerably larger physical conditions than the cyclotron maser. In addition, the radiation, emitted over the second gyroharmonic, freely propagates without a strong reabsorption at the omega(c) layer. All these points can constitute major advantages of this mechanism in an astrophysical context.

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