Hard X-Ray Emission from Active Region Transient Brightenings

Details Hard X-Ray Emission from Active Region Transient Brightenings Hard X-Ray Emission from Active Region Transient Brightenings

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...491..402n&link_type=abstract

Astrophysical Journal v.491, p.402

Astronomy and Astrophysics

Astronomy

15

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

Scientific paper

We present the results of a search for hard X-ray counterparts to soft X-ray transient brightenings in solar Active Region 7260 based on data from the soft and hard X-ray telescopes on board the Yohkoh spacecraft. A total of 72 soft X-ray events are found to accompany hard X-ray emission. They represent strong transient brightenings. The scatter plot between the time-integrated hard X-ray flux and the peak soft X-ray flux indicates that these transient brightenings are not particularly hard X-ray-rich or -deficient in comparison with more intense flares. As in flares, hard X-ray emission is most noticeable during the rise phase of the soft X-ray temporal variations, indicative of its nonthermal origin. We conclude that these soft X-ray transient brightenings are nothing but small flares and predict that hard X-ray emission could be detected from less intense events if an instrument with higher sensitivity were available.

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