Observations of the hard X-ray spectrum of the impulsive phase of solar flares

Details Observations of the hard X-ray spectrum of the impulsive phase of solar flares Observations of the hard X-ray spectrum of the impulsive phase of solar flares

Dec 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...226l..99e&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 226, Dec. 1, 1978, p. L99-L102.

Astronomy and Astrophysics

Astrophysics

31

Solar Flares, Solar Temperature, Solar X-Rays, X Ray Spectra, Bremsstrahlung, Oso-7, Plasma Diagnostics, Thermal Energy

Scientific paper

The impulsive solar hard X-ray spectrum provides a direct diagnostic on the impulsive energy release of the flare. The data from the hard X-ray (14-342 keV) spectrometer on OSO 7 have been examined for events covering a wide energy range to determine the photon spectrum more precisely. This resulted in a sample of 38 events. The data have been fitted with either single- or double-power laws, and with an exponential spectrum, as from thermal bremsstrahlung. The chi-squared statistic between two-parameter fits strongly favors the exponential fit, particularly at peak intensity when the widest energy range is sampled. This result supports a single-temperature thermal source of the impulsive solar hard X-rays with temperatures in the range 4.7-31 keV and emission measures in the range from 8.4 x 10 to the 43rd to 6.0 x 10 to the 46th per cu cm. The temperature reaches a single maximum and then rapidly decays, but the emission measure usually increases throughout, even after temperature maximum, for data with 10-s resolution.

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