Astronomy and Astrophysics – Astronomy
Scientific paper
May 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...516..934s&link_type=abstract
The Astrophysical Journal, Volume 516, Issue 2, pp. 934-938.
Astronomy and Astrophysics
Astronomy
20
Sun: Corona, Sun: Flares, Sun: X-Rays, Gamma Rays
Scientific paper
We examine the occurrence rate of microflares (transient brightenings) in an X-ray bright point (XBP) during the lifetime of the XBP observed with the Yohkoh soft X-ray telescope (SXT). The XBP with a size of ~30^'' appeared near a preceding spot of NOAA 7270 on 1992 September 1 and disappeared on 1992 September 4. The XBP produced 92 microflares during the observation time of the SXT. We found that the occurrence rate (number of events per hour) did not change much during the lifetime of the XBP, although the magnetic flux of the XBP changed. We also found that the frequency distribution of microflares as a function of the soft X-ray peak intensity shows a power law with index 1.7+/-0.4, which is consistent with the previously known index for flares and microflares based on the data for the whole Sun or a whole active region. This result suggests that the power-law distribution of flares holds not only for larger areas but also for smaller areas.
Shibata Kazunari
Shimojo Masumi
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