Physics
Scientific paper
Jun 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aipc..374..294n&link_type=abstract
High energy solar physics. AIP Conference Proceedings, Volume 374, pp. 294-299 (1996).
Physics
Solar Electromagnetic Emission
Scientific paper
Hard X-ray emission is commonly observed in association with solar flares and it is believed to signify interactions of accelerated electrons with the ambient ions. As a first step to understand what conditions are conducive to acceleration of electrons in solar flares, we have analyzed Yohkoh X-ray images for a total of four-dozen events whose hard X-ray spectra extend at least to 100 keV. The morphology of soft X-ray emission relative to hard X-ray sources shows a wide variety, but it is usually confined in a compact loop, which is sometimes topped with a cusp that is much more diffuse. While eruptive behaviors are often seen in the soft X-ray images, it is hard to decide whether they trigger or result from the nonthermal processes. We give a case study which indicates that double hard X-ray sources do not always come from conjugate footpoints of a loop.
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