Comparison of solar flare X-ray producing and escaping electrons from about 2 to 100 keV

Details Comparison of solar flare X-ray producing and escaping electrons from about 2 to 100 keV Comparison of solar flare X-ray producing and escaping electrons from about 2 to 100 keV

Apr 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984soph...91..345p&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 91, April 1984, p. 345-357.

Physics

11

Solar Electrons, Solar Flares, Solar X-Rays, Electronic Spectra, Solar Spectra

Scientific paper

Using observations from the ISEE-3 spacecraft, the X-ray producing electrons and escaping electons from a solar flare on November 8, 1978 are compared. The instantaneous 5 to 75 keV electron spectrum in the X-ray producing region is computed from the observed bremsstrahlung X-ray spectrum. Assuming that energy loss by Coulomb collisions (thick target) is the dominant electron loss process, the accelerated electron spectrum is obtained. The energy spectrum of the escaping electrons observed from 2 to 100 keV differs significantly from the spectra of the X-ray producing electrons and of the accelerated electrons, even when the energy loss which the escaping electrons experienced during their travel from the sun to the earth is taken into account. The observations are consistent with a model where the escaping electons come from an extended X-ray producing region, which ranges from the chromosphere to high in the corona. In this model, the low energy escaping electrons (2-10 keV) come from the higher part of the extended X-ray source where the overlying column density is low, while the high energy electrons (20-100 keV) come from the entire X-ray source.

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