HR: 1340h
AN: SH13A-1130    [Abstracts]
TI: Spectra of Solar Energetic Electrons in Flares and near Earth
AU: * Kontar, E P
EM: eduard@astro.gla.ac.uk
AF: Univserity of Glasgow, The Kelvin Building, Glasgow, G12Q88 United Kingdom
AU: Krucker, S
EM: krucker@ssl.berkeley.edu
AF: Space Sciences Lab UC Berkeley, 7 Gauss Way, Berkeley, CA 94720-7450 United States
AU: Lin, R P
EM: rlin@ssl.berkelely.edu
AF: Space Sciences Lab UC Berkeley, 7 Gauss Way, Berkeley, CA 94720-7450 United States
AB: 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.
DE: 7514 Energetic particles (2114)
DE: 7519 Flares
DE: 7554 X rays, gamma rays, and neutrinos
DE: 2114 Energetic particles, heliospheric (7514)
SC: SPA-Solar and Heliospheric Physics [SH]
MN: 2004 AGU Fall Meeting