Other
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.9312m&link_type=abstract
American Astronomical Society Meeting 210, #93.12; Bulletin of the American Astronomical Society, Vol. 39, p.213
Other
Scientific paper
We present spectral fits for RHESSI and GOES solar flare data that include both a Differential Emission Measure for the thermal component and a power law fit to the nonthermal component. This is an improvement over the traditional isothermal approximation, but it results in ambiguity in the range where the thermal and nonthermal components may have similar photon fluxes. This "crossover" range can be anywhere from 10 to 30 keV for medium to large solar flares.
In this work we will demonstrate the fitting process using simulated data, and then apply it to a small sample of solar flare observations. Our preliminary results indicate that it is extremely diffcult to distinguish between thermal and nonthermal emission in a single spectrum, more so than in the isothermal approximation. This, in turn, creates large uncertainties on the calculation of quantities such as the energy in the thermal plasma, the low energy cutoff of the nonthermal spectrum and the energy in nonthermal electrons.
This research is supported by NASA contract NAS5-98033.
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