Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003apj...595l..89s&link_type=abstract
The Astrophysical Journal, Volume 595, Issue 2, pp. L89-L92.
Astronomy and Astrophysics
Astronomy
17
Sun: Flares, Sun: Particle Emission, Sun: X-Rays, Gamma Rays
Scientific paper
The Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) has observed the 7Be and 7Li γ-ray lines from fusion of accelerated α-particles with ambient helium produced during the 2002 July 23 solar flare that erupted at a heliocentric angle of 73°. This is the first observation of the lines with a germanium spectrometer. We have fitted the measured lines with calculated shapes for different energy and angular distributions for the interacting α-particles. A particle distribution from saturated pitch-angle scattering in the corona provides the best fit, but isotropic, downward-isotropic, or fan-beam distributions also provide acceptable fits. We can rule out a downward-beamed distribution with 99.99% confidence. RHESSI measurements of other Doppler-shifted nuclear de-excitation lines are consistent with a forward isotropic distribution of interacting particles in a magnetic loop tilted by ~40° from the normal to the solar surface toward Earth. Such a distribution is also consistent with the α-4He line shape with ~15% confidence.
Dennis Brian R.
Lin Robert P.
Murphy Ronald J.
Schwartz Richard A.
Share Gerald H.
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