Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsh13a1130k&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SH13A-1130
Physics
7514 Energetic Particles (2114), 7519 Flares, 7554 X Rays, Gamma Rays, And Neutrinos, 2114 Energetic Particles, Heliospheric (7514)
Scientific paper
Successful operation of Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) allows us to observe hard X-ray spectrum of many solar flares with unprecendent energy resolution. X-ray spectra provide us with vital information about the spectral properties of highly energetic electrons at the Sun. The mean electron spectrum of the solar flare can be recovered through a newly developed constraint regularization analysis of the bremsstrahlung photon spectra that energetic electrons produce. We emphasize the use of non-square inversion techniques combined with the correction of the observed spectrum for the effect of Compton photon back-scatter to achieve the most meaningful solution to the problem. For 16 solar flares the electron spectrum of temporally related solar energetic electron events has been measured using WIND/3DP allowing us simultaneous analysis of electron flux spectral properties at the Sun and near the Earth. Electron spectra from solar flares show strong correlations with the spectrum of solar energetic electrons, though vary with energy. Weaker correlation at lower energies can be viewed as a propogation and/or escape effect. Results suggest that the commonly used model of a collisional transport (thick-target) for flare electrons plus free streaming for interplanetary particles cannot explain the observed spectra.
Kontar Eduard P.
Krucker Sa"m
Lin Robert P.
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