HR: 1340h
AN: SH13A-1135    [Abstracts]
TI: Accelerated Particle Spectra and Abundances in the 2003 October 28 and November 2 Solar Flares
AU: * Share, G H
EM: gerald.share@nrl.navy.mil
AF: Naval Research Laboratory, 4555 Overlook Ave Code 7650, Washington, DC 20375 United States
AU: Murphy, R J
EM: murphy@ssd5.nrl.navy.mil
AF: Naval Research Laboratory, 4555 Overlook Ave Code 7650, Washington, DC 20375 United States
AU: Smith, D M
EM: dsmith@scipp.ucsc.edu
AF: University of California Santa Cruz, 1156 High Street, Santa Cruz, CA 95064 United States
AU: Lin, R P
EM: rlin@ssl.berkeley.edu
AF: University of California Berkeley, Dept. of Physics, Berkeley, CA 94720 United States
AU: Shih, A Y
EM: ayshih@ssl.berkeley.edu
AF: University of California Berkeley, Dept. of Physics, Berkeley, CA 94720 United States
AB: We shall discuss analysis of the $\gamma$-ray spectra of the 2003 October 28 and November 2 solar flares. We use flux ratios in nuclear lines such as 6.13 MeV ($^{16}$O)/ 1.63 MeV ($^{20}$Ne) and 2.223 MeV (n-capture)/4.43 MeV ($^{12}$C) to determine the power law spectral index of accelerated protons and $\alpha$-particles. We also determine the accelerated $\alpha$/p ratio by comparing fluxes in the $\alpha$-$^4$He fusion lines between 400 and 500 keV with those in nuclear de-excitation lines. We then discuss measurement of highly broadened nuclear lines that provide information on the accelerated abundances of $^{12}$C, $^{16}$O, and $^{56}$Fe. These measurements of the accelerated particles impacting the Sun can be compared with those observed in space. This work is supported by NASA DPR NNG04ED181 and by ONR.
DE: 7507 Chromosphere
DE: 7513 Coronal mass ejections
DE: 7514 Energetic particles (2114)
DE: 7519 Flares
DE: 2118 Energetic particles, solar
SC: SPA-Solar and Heliospheric Physics [SH]
MN: 2004 AGU Fall Meeting