Other
Scientific paper
May 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003spd....34.1801s&link_type=abstract
American Astronomical Society, SPD meeting #34, #18.01; Bulletin of the American Astronomical Society, Vol. 35, p.839
Other
Scientific paper
On 2002 July 23, the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) detected a GOES X4.8 solar flare, and analysis of the data has produced the first spectrally resolved measurement of nuclear de-excitation lines in a solar flare. We investigate the temporal variability of the flux of these lines by analyzing the observed spectrum for distinct time intervals of the flare. After the first major burst of the flare, the gamma-ray lines produced by iron, carbon, and oxygen show statistically significant changes in their fluxes relative to the neon line, suggesting that the circumstances of ion acceleration change as the flare progresses. We consider possible causes such as a varying alpha/proton ratio or a varying energy spectrum for the ions. Finally, we correlate these variations with other observed variations of the flare.
The work at the University of California, Berkeley, was supported by NASA contract NAS 5-98033.
Krucker Sa"m
Lin Robert P.
Murphy Ronald J.
Schwartz Richard A.
Share Gerald H.
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