Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsh24a..01s&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SH24A-01
Physics
7514 Energetic Particles (2114), 7519 Flares, 7529 Photosphere, 7554 X Rays, Gamma Rays, And Neutrinos
Scientific paper
The Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) has detected nuclear gamma-ray line emission from several large solar flares, including four of the X-class solar flares of October-November 2003. Collisions of accelerated ions with the ambient solar medium produce nuclear de-excitation lines, and these lines are spectrally resolved by RHESSI. The fluxes and shapes of these lines depend on the acceleration spectrum and the composition of the accelerated and ambient populations. Several of these flares exhibit changes in the relative fluxes over time, which in some of the flares is consistent with variations of the ambient abundances according to first-ionization potentials (FIP). Also, since these lines are produced by both accelerated protons and accelerated alpha particles, a detailed study of the line shapes constrains the alpha/proton ratio in these flares. We present the latest results from RHESSI on line-ratio variability and constraints on the alpha/proton ratio.
Lin Robert P.
Murphy Ronald J.
Schwartz Richard A.
Share Gerald H.
Shih Albert Y.
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