Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...194..279m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 194, no. 1-2, April 1988, p. 279-287. SERC-supported research.
Astronomy and Astrophysics
Astrophysics
28
Chromosphere, Coulomb Collisions, Electron Scattering, Extreme Ultraviolet Radiation, Solar Flares, Solar X-Rays, Particle Precipitation, Trapped Particles
Scientific paper
The standard treatment of fast particle pitch-angle diffusion and escape from a magnetic bottle, due to Kennel and Petschek, is briefly reviewed. Melrose and Brown use the results of this treatment to discuss the Coulomb collisional precipitation of solar flare electrons. It is pointed out that this imcompletely represents the physics of the situation, because the Kennel and Petschek results are not intended to apply to scattering mechanisms involving energy loss. The problem of electron scattering and escape is re-formulated in an idealized, exploratory calculation using mean rates of scattering and energy loss. It is found that the Melrose and Brown treatment may substantially overestimate the precipitated flux. This result may help resolve the discrepancy between interpretations of the solar flare EUV and hard X-ray emissions, and may explain aspects of the hard X-ray images from the HXIS and SXT instruments.
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