A search for hard X-ray microflares near solar minimum

Details A search for hard X-ray microflares near solar minimum A search for hard X-ray microflares near solar minimum

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991soph..135...57l&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 135, Sept. 1991, p. 57-64.

Physics

7

Bremsstrahlung, Solar Activity, Solar Cycles, Solar Flares, Solar X-Rays, Balloon Flight, Electron Energy, Solar Electrons

Scientific paper

Near solar maximum, hard X-ray microflares with peak 20 keV fluxes of greater than about 0.01/sq cm s keV, more than ten times smaller than for typical flares and subflares, can occur at the rate of about once every five minutes. A search for hard X-ray microflares made on a long duration balloon flight in February 1987 near solar minimum, at a time when no active regions were on the sun is reported. No microflares were observed over a total observing time of 16.5 hours spread over three days, implying a statistical upper limit to their rate of occurrence about a factor of ten lower than observed near solar maximum. Thus hard X-ray microflaring appears to be an active region phenomenon, and apparently not associated with flaring of soft X-ray bright points.

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