Other
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsh22a0170c&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SH22A-0170
Other
7519 Flares, 7554 X Rays, Gamma Rays, And Neutrinos
Scientific paper
Solar flare plasmas are multi-thermal, and in particular may contain high-temperature components above ˜20 MK. While other solar instruments (e.g. TRACE, GOES SXI) are sensitive to low-temperature plasmas below ˜20 MK, the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) observes photons with energies above 3 keV, and thus is especially sensitive to high-temperature plasmas above ˜10 MK. High-temperature plasma emission includes the Fe/Ni line complexes at ˜6.7 and ˜8 keV, and both the equivalent widths and the fluxes of these line complexes are strongly temperature-dependent. In many flares, RHESSI detects emission in both of these line complexes, as well as emission in the thermal continuum, with spectral resolution of ˜1 keV FWHM. Through imaging and spectroscopy with RHESSI, and by comparison with other solar instruments, we can thus constrain the temperatures and emission measures over the entire range of thermal plasmas. We present a spectroscopic analysis of a variety of flares, including the X1.5 event on 21 April 2002, to determine the time-varying characteristics of the thermal electron populations. We estimate the energy contained in thermal electrons and compare with the energy contained in the time-varying non-thermal electron population. Finally, we discuss the implications for heating and energy transport in flares with high-temperature components.
Caspi Amir
Krucker Sa"m
Lin Robert P.
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