Microwave transition radiation in solar flares and in astrophysics

Details Microwave transition radiation in solar flares and in astrophysics Microwave transition radiation in solar flares and in astrophysics

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...394..688f&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 394, no. 2, Aug. 1, 1992, p. 688-696. Research supported by Scientific Exch

Astronomy and Astrophysics

Astrophysics

15

Charged Particles, Microwave Spectra, Radio Emission, Solar Flares, Solar Radiation, Plasma Density, Plasma Turbulence, Relativistic Particles, Solar Flux, Solar Magnetic Field

Scientific paper

The role of transition radiation in astrophysical sources of radio emission is considered. The principal results of the theory of transition radiation by relativistic particles in a magnetoactive turbulent plasma are presented. Such plasmas are frequently encountered in astrophysical conditions, particularly in solar flares. It is shown that transition radiation in solar flares is generated most effectively in the range f about (0.5-10) GHz, with fluxes possibly exceeding 1000 solar flux units. It is shown that transition radiation can be the main radiation mechanism in both weak and strong solar flares at certain frequency bands in dense plasmas. In strong magnetic fields it is generated only by protons because that of the electrons is strongly suppressed. In this case, the polarization of the transition radiation corresponds to the O-mode. However, it is found that the emission from relativistic protons in flares as a rule is not significant.

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