Preflare Phenomena in Eruptive Flares

Details Preflare Phenomena in Eruptive Flares Preflare Phenomena in Eruptive Flares

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh22a03c&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SH22A-03

Physics

2111 Ejecta, Driver Gases, And Magnetic Clouds, 7507 Chromosphere, 7519 Flares, 7531 Prominence Eruptions

Scientific paper

We report the results of a statistical study of the relationship between eruptive solar flares and an observed pre-flare phenomenon we call blue shift events (BSEs). BSEs are believed to be the result of magnetic reconnections in the chromosphere. Data for the study, Hα CCD spectrograph images, were recorded at Mees Solar Observatory in Hawaii. In order for a flare to be chosen for our study, it had to be well observed by both the Mees Solar Observatory and Yohkoh. Therefore, the dataset studied contains both eruptive and non-eruptive flares, without bias. Once we finished analyzing each flare event for BSEs, we determined whether or not the flare was eruptive. Out of 16 events observed, the average rate of BSEs was five times greater prior to eruptive flares than prior to non-eruptive ones. Also, the rate of BSEs prior to eruptive flares was six times greater than after the flares. From this high correlation, we conclude that reconnections in the lower corona play a role in solar flare eruptions.

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