OSO-7 observations of solar X-rays in the energy range 10-100 keV

Details OSO-7 observations of solar X-rays in the energy range 10-100 keV OSO-7 observations of solar X-rays in the energy range 10-100 keV

Nov 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974soph...39..155d&link_type=abstract

Solar Physics, vol. 39, Nov. 1974, p. 155-174.

Astronomy and Astrophysics

Astronomy

118

Oso-7, Satellite Observation, Solar X-Rays, X Ray Astronomy, Energy Distribution, H Alpha Line, Radiant Flux Density, Satellite-Borne Instruments, Solar Instruments, Solar Limb, Spatial Distribution, Time Response

Scientific paper

Data on 123 hard X-ray bursts observed by the satellite OSO-7 between Oct. 10, 1971 and June 6, 1972 are described and evaluated. Typical duration of a burst is 100 sec. Average spectral indices lie between 3.5 and 5.5 for two-thirds of the 123 bursts, with a median of 4.6. In some events a soft-hard-soft pattern is observed, but there are numerous examples in which the spectrum softens continuously throughout the burst. The mean shape of the hard X-ray time profile as measured by the full width at half maximum does not depend on burst amplitude; nor does the spectral hardness correlate with the flux. The distribution of burst peak fluxes and the observation of large soft X-ray bursts without accompanying hard X rays suggest the existence of a distinct class of solar flares which emit only soft X rays. No center-to-limb variation was found in the frequency of occurrence of bursts or in the fraction with a nonthermal component. Estimates of the energy in the form of nonthermal electrons and in the flare plasma derived from these data indicate that the total amounts in each are comparable.

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