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Preflare Phenomena in Eruptive Flares View all abstracts by submitter

Richard Canfield   Submitted: 2003-08-04 10:23

We report the results of a statistical study of the relationship between eruptive solar flares and an observed Hα preflare phenomenon we call moving blue shift events (MBSEs). The Hα data were gathered using the Mees Solar Observatory CCD imaging spectrograph (MCCD). The 16 events in our dataset were observed by both the MCCD and the Yohkoh Soft X-Ray Telescope (SXT), typically for at least three hours prior to the flare, and in some cases repeatedly for several days prior to the flare. The dataset contains both eruptive and non-eruptive flares, without bias. Focusing on three-hour periods before and after the flares, we found the average rate of MBSEs prior to the flares was ~5 times greater prior to the 11 eruptive flares than prior to the 5 non-eruptive ones. Also, the average rate of MBSEs dropped by a factor of ~6 after the eruptive flares. Earlier studies inferred that MBSEs reflect motions that originate in the readjustment of magnetic fields after magnetic reconnection. From the high correlation between eruptive flares and preflare MBSEs in the several hours prior to such events, we conclude that reconnection in the chromosphere or low corona plays an important role in establishing the conditions that lead to solar flare eruptions.

Authors: Des Jardins, Angela C., Canfield, Richard C.
Projects: Yohkoh-SXT

Publication Status: ApJ, 598, 678, 2003
Last Modified: 2003-11-20 11:23
Go to main E-Print page  Far UV Spectra of Fast Coronal Mass Ejections Associated with X-class Flares  The Relationship Between X-ray Radiance and Magnetic Flux  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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