Other
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994kofu.symp...57h&link_type=abstract
In: Proceedings of Kofu Symposium, Kofu, Japan, Sept. 6-10, 1993, p.57-60.
Other
Scientific paper
We report initial analysis of image brightness distributions that concisely represent the spatial structure of the solar X-ray corona. This research makes use of histograms of pixel brightnesses obtained from whole-Sun images from the soft X-ray telescope (SXT) aboard Yohkoh. We discover that the soft X-ray intensity histogram essentially consists of a power-law distribution in bright regions and another one in less bright regions. Active regions show a power-law intensity distribution, whereas quiet regions have non-power law distribution. The comparison of the histograms in the active and less active phases shows that the integrated soft X-ray variability is related to a variation of the total area and the appearance/disappearance of bright component of active regions. The overall shapes of the X-ray histograms are similar to those of histograms of the photospheric magnetic fields given by Schrijver and Harvey (1989), implying that a coronal brightness distribution is related to a magnetic field distribution on the photosphere.
Hara Hisayuki
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