Deep Survey of Solar Nanoflares with YOHKOH

Details Deep Survey of Solar Nanoflares with YOHKOH Deep Survey of Solar Nanoflares with YOHKOH

Sep 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...486.1045s&link_type=abstract

Astrophysical Journal v.486, p.1045

Astronomy and Astrophysics

Astronomy

45

Sun: Activity, Sun: Corona, Sun: Flares, Sun: X-Rays, Gamma Rays

Scientific paper

Short timescale variability fainter than transient brightenings (microflares) is found in the solar position-dependent light curves observed with the Yohkoh Soft X-Ray Telescope. The time variability is found almost everywhere in active regions and X-ray bright points, while no significant variability is found in quiet regions. An intensity correlation is found between the magnitudes of the time variability and the intensities of the persistent corona. The time variability is apparently related to the heating mechanism of the persistent active-region corona. The intensity correlation can be explained with the idea that the persistent corona is made of extremely numerous nanoflares, larger ones of which are observed as the time variability. The alternative explanation is that a common parameter controls both the persistent corona and the time variability.

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