Impulsive 7-10 keV Solar X-ray Bursts

Details Impulsive 7-10 keV Solar X-ray Bursts Impulsive 7-10 keV Solar X-ray Bursts

May 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...188.7010f&link_type=abstract

American Astronomical Society, 188th AAS Meeting, #70.10; Bulletin of the American Astronomical Society, Vol. 28, p.939

Astronomy and Astrophysics

Astronomy

3

Scientific paper

We report on new evidence for accelerated electrons down to ~ 7-10 keV in solar flares. Using the BATSE Spectroscopy Detectors, which have an effective area more than 10-100 times that of any solar observing instrument to date in this energy range, we have identified 144 events in ~ 30 hours of data during 1-2 October 1991. 76 of these events have no observable >25 keV hard X-rays in the BATSE Large Area Detectors, and 37 of these soft events have an e--folding decay time <30 seconds. The impulsive nature of these events, as compared to the GOES-measured 0.5-4.0 Angstrom thermal emission, suggests that they originate from non-thermal accelerated electrons. We find the best-fit power-law photon spectra and estimate that the average rate of energy release in accelerated electrons may be comparable to the amount of energy needed to heat the corona. These events may also be the low-energy extension of the microflares observed previously using instruments that were sensitive only at energies >20 keV.

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