Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh23a0334b&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SH23A-0334
Other
7519 Flares, 7524 Magnetic Fields, 7554 X-Rays, Gamma Rays, And Neutrinos
Scientific paper
The size distribution of solar flares shows how the occurrence frequency of flares varies with flare size. The size distribution of flares seems to be well represented by a power law, with a negative power law index about 2. An avalanche model for solar flares was proposed on the basis that the size distribution of flares does not vary. However, a careful analysis of solar flare sizes as measured by peak soft X-ray flux for the recent four solar cycles shows that the size distribution varies from year to year, from solar cycle to solar cycle, and with active region types. Active regions producing large numbers of flares seem to have flatter size distributions. In other words, prolific active regions seem to produce relatively smaller numbers of small-size flares. This seems to be the underlying cause of time variability of the size distribution. The size distribution is flatter during the time interval when prolific active regions produce a larger portion of solar flares, and vice versa. In this paper, relative timing of solar flares in prolific active regions will also be studied to understand why prolific active regions produce relatively fewer small flares.
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