34th Solar Physics Division Meeting, June 2003
Session 5 Coronal Mass Ejections I
Poster, Monday, June 16, 2003, 3:30-5:00pm, Mezzanine

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[5.15] Rapid Acceleration of a Coronal Mass Ejection in the Low Corona and Implications for Propagation

P. Gallagher (EER Systems/NASA GSFC), G. Lawrence (CUA/NASA GSFC), B. Dennis (NASA GSFC)

A high-velocity Coronal Mass Ejection (CME) associated with the 2002 April 21 X1.5 flare is studied using a unique set of observations from the Transition Region and Coronal Explorer (TRACE), the Ultraviolet Coronagraph Spectrometer (UVCS), and the Large-Angle Spectrometric Coronagraph (LASCO). The event is first observed as a rapid rise in GOES X-rays, followed by two simultaneous brightenings which appear to be connected by an ascending loop-like feature. While expanding, the appearance of the feature remains remarkably constant as it passes through the TRACE 195~Å\ passband and LASCO fields-of-view, allowing its height-time behaviour to be acurately determined. The acceleration is consistent with an exponential rise with an e-folding time of ~138~s and peaks at ~1500~m~s-2 when the leading-edge is at ~1.7~R\sun from Sun center. The acceleration subsequently falls off with an e-folding time of over 1000~s. At distances beyond ~3.4~R\sun, the height-time profile is approximately linear with a constant velocity of ~2500~km~s-1. These results are briefly discussed in light of recent kinematic models of CMEs.

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Bulletin of the American Astronomical Society, 35 #3
© 2003. The American Astronomical Soceity.