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RHESSI Line and Continuum Observations of Super-hot Flare Plasma View all abstracts by submitter

Amir Caspi   Submitted: 2010-12-01 11:27

We use RHESSI high-resolution imaging and spectroscopy observations from ~5 to 100 keV to characterize the hot thermal plasma during the 2002 July 23 X4.8 flare. These measurements of the steeply falling thermal X-ray continuum are well fit throughout the flare by two distinct isothermal components: a super-hot (Te > 30 MK) component that peaks at ~44 MK and a lower-altitude hot (Te <~ 25 MK) component whose temperature and emission measure closely track those derived from GOES measurements. The two components appear to be spatially distinct, and their evolution suggests that the super-hot plasma originates in the corona, while the GOES plasma results from chromospheric evaporation. Throughout the flare, the measured fluxes and ratio of the Fe and Fe-Ni excitation line complexes at ~6.7 and ~8 keV show a close dependence on the super-hot continuum temperature. During the pre-impulsive phase, when the coronal thermal and non-thermal continua overlap both spectrally and spatially, we use this relationship to obtain limits on the thermal and non-thermal emission.

Authors: A. Caspi & R. P. Lin
Projects: RHESSI

Publication Status: Published -- Caspi, A. & Lin, R. P. 2010, ApJ, 725, L161; DOI 10.1088/2041-8205/725/2/L161
Last Modified: 2014-05-30 14:00
Go to main E-Print page  RECONNECTION AND ENERGETICS IN TWO-RIBBON FLARES: A REVISIT OF THE BASTILLE-DAY FLARE   Magnetohydrodynamic kink waves in two-dimensional non-uniform prominence threads  Edit Entry  Download Preprint  Delete Entry 

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