✦ LIBER ✦

Hard X-ray bursts from flares behind the solar limb

✍ Scribed by David L. Mckenzie

Publisher: Springer
Year: 1975
Tongue: English
Weight: 459 KB
Volume: 40
Category: Article
ISSN: 0038-0938
DOI: 10.1007/bf00183161

No coin nor oath required. For personal study only.

✦ Synopsis

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 arm 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 x 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 3a 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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