TRACE Observations of Flare Ribbon Evolution

Details TRACE Observations of Flare Ribbon Evolution TRACE Observations of Flare Ribbon Evolution

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sp42a12w&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SP42A-12

Physics

7509 Corona, 7519 Flares, 7549 Ultraviolet Emissions, 7554 X Rays, Gamma Rays, And Neutrinos

Scientific paper

We present very high cadence (2--3 s) Transition Region and Coronal Explorer (TRACE) observations of the M1.1 flare that occurred on 2000 March 17 at 11:10 UT. In this flare we find evidence for flare ribbon brightenings in TRACE broadband 1600 Å images that precede the onset of the hard X-ray emission measured with the Burst and Transient Source Experiment (BATSE) by as much as several minutes. Many of the flare footpoints that show pre-flare activity also brighten significantly during impulsive phase of the flare. Regression analysis between the TRACE and BATSE light curves, however, shows that hard x-ray emission is more strongly correlated with footpoints that show no pre-flare activity. This suggests that energy release during the pre-flare and impulsive phases of the flare may not be directly related. We discuss these results in the context of recent observations of strong nonthermal broadening that precedes the onset of hard X-ray emission.

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