Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasj...44l.147s&link_type=abstract
PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 44, no. 5, p. L147-L153.
Astronomy and Astrophysics
Astronomy
151
Brightness Distribution, Emission Spectra, Solar Activity, Solar Magnetic Field, Spaceborne Telescopes, X Ray Telescopes, Japanese Spacecraft, Transient Response
Scientific paper
The Soft X-ray Telescope aboard the Yohkoh satellite has revealed that active regions show many compact loop brightenings which we call 'active-region transient brightenings'. The released energy by an active-region transient brightening is considerably less than 10 exp 29 erg, which is the low end of the subflare energy range. Small soft X-ray enhancements observed by the GOES saellites are identified to relatively intense active-region transient brightenings. The transient brightening occurs on the average of one every 3 min in 'active' active regions and down to one every 1 hr in 'quieter' active regions. This suggests that the transient brightening is a very common phenomenon in active regions and that the magnetic loops in active regions are far from static.
Acton Loren W.
Lemen James R.
Shimizu Toshifumi
Tsuneta Saku
Uchida Yutaka
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