High-temperature flares observed in broadband soft X-rays

Details High-temperature flares observed in broadband soft X-rays High-temperature flares observed in broadband soft X-rays

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992soph..141..109g&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 141, no. 1, p. 109-126.

Physics

19

Broadband, High Temperature Plasmas, Solar Flares, Solar Limb, Solar X-Rays, Goes Satellites, Solar Cycles, Solar Temperature

Scientific paper

Broadband soft solar X-rays monitored by the GOES satellites have been used to detect high-temperature flares (higher than 25 MK). The data suggest that there are two general categories of high-temperature flares: those that are intrinsically hot and recur repeatedly in particular active regions and those that show enhanced temperatures because of their proximity to the solar limb. Intrinsically hot flares associate with gamma-ray flares and impulsive hard X-ray flares. Hot flares show a small incidence with gradual hard X-ray flares, but those cases are either extremely intense flares or limb flares. The apparently hot flares occur near the visible limb, which suggests the strong thermal stratification of flare plasmas as demonstrated by over-the-limb events; even on the visible disk near the limb, the lower, cooler plasmas are somehow partially occulted.

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