Study of Flare Productive Active Regions

Details Study of Flare Productive Active Regions Study of Flare Productive Active Regions

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...180.1807n&link_type=abstract

American Astronomical Society, 180th AAS Meeting, #18.07; Bulletin of the American Astronomical Society, Vol. 24, p.755

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Scientific paper

The Soft X-ray Telescope (SXT) on the Yohkoh spacecraft has made it possible for us for the first time to monitor the evolution of active regions in soft X-rays with a good cadence and spatial resolution over an extended period of time. One of our interests is what makes an active region produce large flares. Since the SXT started its operation, we have identified more than 40 active regions that have produced flares whose GOES class are > M1. Although many such active regions appear active when they first become visible on the eastern limb, we have succeeded in observing some of them from their birth through activation. We compare X-ray images taken from the SXT with magnetograms and other groundbased data. We discuss similarities and differences of such regions from other more quiet regions in terms of morphology and physical parameters.

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