Temperature Profiles of Super-Hot Flare Plasma using the Transition Region and Coronal Explorer (TRACE)

Details Temperature Profiles of Super-Hot Flare Plasma using the Transition Region and Coronal Explorer (TRACE) Temperature Profiles of Super-Hot Flare Plasma using the Transition Region and Coronal Explorer (TRACE)

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000spd....31.0263r&link_type=abstract

American Astronomical Society, SPD Meeting #31, #02.63; Bulletin of the American Astronomical Society, Vol. 32, p.822

Astronomy and Astrophysics

Astronomy

Scientific paper

The Transition Region and Coronal Explorer (TRACE) provides some of the highest spatial resolution images ever taken of hot solar flare plasma. The TRACE 195 Angstroms channel is particularly sensitive to flare plasma because of the presence of the Fe XXIV 192 Angstroms resonance line in this bandpass. Using TRACE filter ratios to derive temperatures and emission measures during flares is often difficult, however, because the 171 Angstroms channel is predominately hydrogen continuum emission. This emission is generally weak and often hard to distinguish from the background corona. A very large flare, such as the X2 flare observed on March 24, 2000, yields high counts in the 171 Angstroms channel so that background emission becomes insignificant. Analysis of these data show steep temperature gradients below the brightest flare plasma in the arcade. These data also show large 195 Angstroms/171 Angstroms ratios above the arcade, suggesting localized regions of super-hot plasma. Interpretation of the filter ratios depends on the absolute abundance of Fe, however, and we re-examine past measurements of Fe abundances in flares.

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