Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsh44c..01s&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SH44C-01
Physics
7514 Energetic Particles (2114), 7519 Flares, 7529 Photosphere, 7554 X-Rays, Gamma Rays, And Neutrinos
Scientific paper
Solar flares accelerate both ions and electrons, and the energy content in accelerated ions may be comparable to that in accelerated electrons. The signature of ion acceleration is the emission of gamma-ray lines that result from nuclear interactions in the ambient solar atmosphere, and the gamma-ray line most easily observed by the high-resolution detectors on the Reuven Ramaty High-Energy Solar Spectroscopic Imager ( RHESSI) is the 2.223~MeV neutron-capture line. Unfortunately, gamma-ray lines are often too weak to observe in all but the largest flares, but it is of interest to be able to put constraints on ion acceleration in the more frequently occurring smaller flares. We combine the spectra of many small flares to obtain limits on the average neutron-capture line flux for small flares and discuss the implications of these limits relative to previous studies of larger flares. The work at the University of California, Berkeley, was supported by NASA contract NAS 5-98033.
Hudson Hugh S.
Lin Robert P.
Shih Albert Y.
Smith Masson D.
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