Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...338.1122l&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 338, March 15, 1989, p. 1122-1130. Previously announced in STAR as N88-2628
Astronomy and Astrophysics
Astrophysics
25
Microwaves, Ratios, Solar Flares, Solar Radiation, X Ray Irradiation, Bremsstrahlung, Density (Mass/Volume), Magnetic Fields, Models, Pressure Distribution, Solar Spectra, Synchrotron Radiation, Targets
Scientific paper
The expected ratio of synchrotron microwave radiation to bremsstrahlung X-rays for thick target, thin target, and multithermal solar flare models is calculated. The calculations take into account the variation of the microwave to X-ray ratio with X-ray spectral index. The theoretical results are compared with observed ratios of a sample of 51 solar flares with well known spectral index. From this it is concluded that the nonthermal thick target model with a loop length of and order of 10 to the 9th power cm and a magnetic field of 500 + or - 200 G provides the best fit to the data. The thin target and multithermal models require unreasonably large density or pressure and/or low magnetic field to match the data.
Lu Edward T.
Petrosian Vahe
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