Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsh52a0462h&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SH52A-0462
Physics
7514 Energetic Particles (2114), 7519 Flares, 7554 X Rays, Gamma Rays, And Neutrinos
Scientific paper
Gamma-ray spectroscopy of nuclear line emission has provided the primary observational tool for the study of accelerated nuclei near the Sun. The Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI), launched in February 2002, is an imaging-spectrometer which not only does high-resolution spectroscopy from 3 keV to 17 MeV, but also images gamma-rays with angular resolution as high as 35 arcseconds. This enables the emission sites of the 2.2 MeV capture line (from thermalized neutrons), of the Doppler-broadened, prompt gamma-ray continuum and of the hard x-ray continuum (from accelerated electrons) to be located within the flaring active region. Comparison of these locations can provide a new perspective on acceleration and transport processes. The X4.8 limb flare of 23 July 2002 provided the first opportunity to observe solar gamma-ray lines with RHESSI. This paper presents the first solar gamma-ray images of the 2.2 MeV line and of the 4 to 7 MeV gamma-ray range which is dominated by excitation lines of C and O. The locations of these gamma-ray sources will be compared to those of the hard x-ray sources.
Hurford Gordon J.
Krucker Sa"m
Lin Robert P.
Schwartz Richard A.
Smith Masson D.
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