Hard X-ray emission in electron-heated solar flares - A comparison of nonthermal and thermal contributions

Details Hard X-ray emission in electron-heated solar flares - A comparison of nonthermal and thermal contributions Hard X-ray emission in electron-heated solar flares - A comparison of nonthermal and thermal contributions

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987soph..110..305b&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 110, no. 2, 1987, p. 305-315.

Physics

13

Electron Energy, Emission Spectra, Nonthermal Radiation, Plasma Heating, Solar Flares, Spectral Energy Distribution, Thermal Radiation, X Ray Spectra, Bremsstrahlung, Plasma-Particle Interactions, Spatial Distribution, Stellar Models

Scientific paper

The authors calculate the spatial structure of hard X-ray emission during the impulsive phase of electron-heated solar flares. Both direct non-thermal bremsstrahlung and the thermal bremsstrahlung arising from the heated plasma are considered. The results indicate that the spread of non-thermal emission into the upper parts of the loop, through evaporation of the chromospheric target, may be more important than the appearance of a hot thermal source in the corona. The effects of varying the viewing angle to the flare loop, and of finite-size resolution element, are also considered. The results are compared with observations from the Solar Maximum Mission Hard X-Ray Imaging Spectrometer. By contrasting the predicted structures with those predicted by other models of flare energy release, it is found that the electron-heated model provides the most satisfactory agreement with the observations.

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