The super-hot thermal component in the decay phase of solar flares

Details The super-hot thermal component in the decay phase of solar flares The super-hot thermal component in the decay phase of solar flares

Sep 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985soph...99..263l&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 99, Sept. 1985, p. 263-275.

Physics

12

Magnetic Field Configurations, Plasma Decay, Radiant Flux Density, Solar Flares, Solar X-Rays, Stellar Temperature, Balloon-Borne Instruments, Continuous Spectra, Iron, Line Spectra, Satellite-Borne Instruments, Spectral Energy Distribution, X Ray Spectra

Scientific paper

Solar X-ray observations from balloons and from the SMM and Hinotori spacecraft have revealed evidence for a superhot thermal component with a temperature of more than about 3 x 10 to the 7th K in many solar flares, in addition to the usual 10-20 x 10 to the 6th K soft X-ray flare plasma. The decay phase of 35 solar flare X-ray events observed by ISEE-3 during 1980 was systematically studied. Based on fits to the continuum X-ray spectrum in the 4.8-14 keV range and to the intensity of the 1.9 A feature of iron lines, it was found that 15 (about 43) of the analyzed events have a superhot thermal component in the decay phase of the flare. In this paper, the important properties of the superhot thermal component in the decay phase are summarized. It is found that an additional input of energy is required to maintain the superhot thermal components. Finally, it is suggested that the superhot thermal component in the decay phase is created through the reconnection of the magnetic field during the decay phase of solar flares.

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