Hard X-ray bursts from flare behind the solar limb

Details Hard X-ray bursts from flare behind the solar limb Hard X-ray bursts from flare behind the solar limb

Jan 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975soph...40..183m&link_type=abstract

Solar Physics, vol. 40, Jan. 1975, p. 183-191.

Physics

14

Particle Acceleration, Solar Flares, Solar Limb, Solar X-Rays, X Ray Spectra, Bursts, H Alpha Line, High Energy Electrons, Radiant Flux Density, Solar Atmosphere

Scientific paper

The determination of the location of the region of origin of hard X-rays is important in evaluating the importance of 10-100 keV electrons in solar flares and in understanding flare particle acceleration. At present only limb-occulted events are available to give some information on the height of X-ray emission. In fifteen months of OSO-7 operation, nine major soft X-ray events had no reported correlated H alpha flare. We examine the hard X-ray spectra of eight of these events with good candidate X-ray flare producing active regions making limb transit at the time of the soft X-ray bursts. All eight bursts had significant X-ray emission in the 30-44 keV range, but only one had flux at the 3 sigma level above 44 keV. The data are consistent with most X-ray emission occurring in the lower chromosphere, but some electron trapping at high altitudes is necessary to explain the small nonthermal fluxes observed.

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