Physics
Scientific paper
Sep 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985soph...99..219h&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 99, Sept. 1985, p. 219-230. DFG-supported research.
Physics
2
Solar Electrons, Solar Flares, Solar Limb, Solar X-Rays, X Ray Imagery, Spectrum Analysis, Temporal Distribution, X Ray Spectroscopy
Scientific paper
X-ray images taken by the Hard X-ray Imaging Spectrometer (HXIS) aboard SMM during the November 18, 1980, limb flare are analysed. The temporal and spatial evolutions of the X-radiation are described. They differ significantly for hard and soft X-rays. During the elementary flare bursts energetic photons are predominantly emitted from a region close to the solar limb. In contrast, the soft X-ray sources are situated higher in the solar atmosphere. The observed X-ray spectra, in particular those emitted from small source regions at various altitudes, were fitted to power laws. Analysis of the spatial variation of the spectral index shows that there is a systematic tendency of the spectra to get harder with decreasing source altitude, especially during the elementary flare bursts. This fact is in agreement with the existence of nonthermal electron beams precipitating from the corona towards the denser layers of the solar atmosphere.
Elwert Gerhard
Haug Eberhard
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