Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000spd....31.0150m&link_type=abstract
American Astronomical Society, SPD Meeting #31, #01.50; Bulletin of the American Astronomical Society, Vol. 32, p.1289
Astronomy and Astrophysics
Astronomy
Scientific paper
In a growing number of CME events, the X-ray images from Yohkoh SXT reveal velocity fields above the eruption site, directed downward into the top of the flare arcade. These motions, with plane-of-sky speeds typically between 50 -- 500 km s-1, are evidenced by both dark (in X-rays) and bright (i.e., X-ray emitting) features, some of which appear to have a looplike morphology. No counterparts have been detected in simultaneous Hα or EUV imagery. The ``supra-arcade downflows" are tentatively interpreted as resulting from magnetic field line shrinkage, a signature of outflow from reconnection sites above the post-eruption arcade. I will present a summary of the flare events in which these velocity fields have been detected (to date, 17 in the last two years), and movies showing the structure and motion above some of the flare arcades. This work was supported by NASA under Marshall Space Flight Center contract NAS8-40801 with the Lockheed Martin Advanced Technology Center.
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