Statistics – Computation
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...183..341k&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 183, no. 2, Sept. 1987, p. 341-350.
Statistics
Computation
47
Electron Energy, Magnetoactivity, Microwave Spectra, Plasma Density, Plasma Probes, Solar Flares, Computational Astrophysics, Radiant Flux Density, Solar Radiation, Solar Radio Bursts, Solar X-Rays, Synchrotron Radiation
Scientific paper
The author presents a formalism for the approximate computation of gyrosynchrotron radiation from mildly relativistic electrons. It enables a rapid numerical computation in the case of an isotropic or weakly anisotropic electron population. The author discusses quantitatively a solar flare with a peculiar flux spectrum: The flux increases from long to short millimetre waves, while the emission at centimetric waves, where the bulk of the microwave radiation is generally emitted, is negligible. Various authors considered that such a spectrum is inconsistent with the general interpretation of hard X-ray and microwave bursts in terms of respectively bremsstrahlung and gyrosynchrotron radiation from electrons up to some MeV. It is shown here that the observed microwave spectrum is readily explained by suppression and absorption of gyrosynchrotron radiation, and that the hard X-ray and microwave radiation of this event are consistent with a common distribution of mildly relativistic electrons.
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