Impulsive and gradual hard X-ray sources in a solar flare

Details Impulsive and gradual hard X-ray sources in a solar flare Impulsive and gradual hard X-ray sources in a solar flare

Apr 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...108..306v&link_type=abstract

Astronomy and Astrophysics, vol. 108, no. 2, Apr. 1982, p. 306-313.

Physics

84

Solar Flares, Solar X-Rays, X Ray Sources, Bremsstrahlung, Cosmic Plasma, Electron Density (Concentration), International Sun Earth Explorer 3, Periodic Variations, Radiant Flux Density, Solar Atmosphere, Solar Physics, Solar Spectra, Stellar Models, Temporal Distribution, Type 4 Bursts, X Ray Spectra, X Ray Spectroscopy

Scientific paper

The paper reports recent observations of a relatively large hard X-ray burst with well developed impulsive and gradual components, that was associated with a relatively modest optical flare on Aug. 14, 1979. The impulsive X-ray source has a much higher ion density and the electron injection in the phase is shorter in duration consisting of fewer energetic electrons than in the gradual phase. The gradual X-ray source seems to consist of a lower density region, probably bounded by a magnetic arch in which the energetic electrons are perfectly trapped. The different temporal development of the impulsive and gradual hard X-ray components suggest large differences in the physical parameters of the ambient plasma.

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