Arcade Structure and Dynamics in the 20-Jan-99 M5 Solar Flare

Details Arcade Structure and Dynamics in the 20-Jan-99 M5 Solar Flare Arcade Structure and Dynamics in the 20-Jan-99 M5 Solar Flare

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...19410108m&link_type=abstract

American Astronomical Society, 194th AAS Meeting, #101.08; Bulletin of the American Astronomical Society, Vol. 31, p.999

Astronomy and Astrophysics

Astronomy

Scientific paper

We present observations of a remarkable solar flare which was observed by Yohkoh on 20-Jan-99. This long duration event is notable because the Yohkoh images show not only the formation of the arcade associated with the coronal mass ejection, but also a considerable amount of structure and motion in the current sheet above the arcade. Though not unique, the structure of this arcade is different from the majority of flare arcades observed by Yohkoh. The motions indicate field line shrinkage during the rise phase of the flare, and downward flow above the arcade during the decay phase. The late-phase downward motion suggests the possibility either of a high-Beta regime in the current sheet, or of shrinkage of evacuated flux tubes downward through the current sheet. This research is supported by NASA under MSFC contract NAS8-40801.

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