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Session 70 - Solar Flares and Ejections.
Display session, Thursday, June 13
Tripp Commons,

[70.07] Observations of Coronal Depletion and Ejection

J. R. Lemen (Lockheed Martin Research Lab.), H. Hudson (Univ. of Hawaii), D. Webb (ISR-Boston College), S. Tsuneta (Univ. of Tokyo)

We present the analysis of the Yohkoh/SXT observations of a long-decay event that was observed on 1992 February 21. This event, previously reported by Tsuneta et al.\ 1992, had a clearly observed compact ejection at its onset. There is also evidence for a depletion of material in the corona above the flare site (coronal dimming) accompanying the onset of flare brightening. We find a lower limit of 3 \times 10^14 g for this mass depletion. This event was observed near the limb as an arcade viewed almost end-on. Its morphology resembles the classical reconnection model for a solar flare. Here we describe the early phase of this event when the outward motions as observed in the SXT images are interpreted as the X-ray signature of a coronal mass ejection (no white-light images are available). The coronal depletion marks the beginning of the outward motion and occurs simultaneously with hard X-ray emission. If this marks the beginning of a CME, then this event provides support for a close connection between of X-ray flares and coronal mass ejections.

Program listing for Thursday