Is the 'superhot' hard X-ray component in solar flares consistent with a thermal source?

Details Is the 'superhot' hard X-ray component in solar flares consistent with a thermal source? Is the 'superhot' hard X-ray component in solar flares consistent with a thermal source?

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989soph..122..313e&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 122, no. 2, 1989, p. 313-317.

Physics

10

Bremsstrahlung, Solar Flares, Solar X-Rays, Thermal Radiation, Energy Spectra, Radiation Sources

Scientific paper

It has been shown by Brown and Emslie (1988) that any optically thin thermal bremsstrahlung source must emit an energy spectrum L(epsilon)(keV/s per keV) which has the property that higher derivatives alternate in sign. In this short note, this test is applied to the 'superhot' component discussed by Lin et al. (1981) in order to determine whether a strictly thermal interpretation of this component is valid. All statistically significant higher derivatives do indeed have the correct sign; this strengthens the identification of this component as due to a thermal source.

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