Fast variations in high-energy X-rays from solar flares and their constraints on nonthermal models

Details Fast variations in high-energy X-rays from solar flares and their constraints on nonthermal models Fast variations in high-energy X-rays from solar flares and their constraints on nonthermal models

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...287l.105k&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 287, Dec. 15, 1984, p. L105-L108.

Astronomy and Astrophysics

Astrophysics

44

Coronal Loops, Satellite-Borne Instruments, Solar Flares, Solar Maximum Mission, Solar X-Rays, X Ray Spectra, Time Dependence, X Ray Spectroscopy

Scientific paper

The results of a quantitatve analysis of quantitative the temporal properties of over 7000 hard X-ray solar flares are presented. The data were obtained with the Hard X-ray Burst Spectrometer of the SMM satellite. The data reveal examples of hundreds of fast spikes with durations of less than 1 s. The spectra of a well-observed fast spike were compared with the predicted spectra of a detailed nonthermal electron beam model, in order to determine upper limits for electron beam parameters and path lengths. The theoretical spectra were found to be consistent with the observed spectra when the separation of between the accretion site and the thick target was greater than 10 to the 8th cm. It is shown that if the separation is much greater than 3 x 10 to the 9th cm, the electrons with high pitch angles (greater than 60 deg) are either not emitted or are mirrored before they reach the footpoints.

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