AAS Meeting #194 - Chicago, Illinois, May/June 1999
Session 101. Coronal Mass Ejections
Oral, Thursday, June 3, 1999, 2:00-3:30pm, Continental Ballroom B

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

D. E. McKenzie (Montana State Univ.), H. S. Hudson (Solar Physics Research Corp.)

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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