Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.9333w&link_type=abstract
American Astronomical Society Meeting 210, #93.33; Bulletin of the American Astronomical Society, Vol. 39, p.217
Astronomy and Astrophysics
Astronomy
Scientific paper
Ions accelerated in solar flares interact with the solar atmosphere to produce gamma-ray lines and neutrons. Some of the neutrons that escape from the Sun into interplanetary space can survive to the Earth and be observed both by satellite detectors and by ground-based neutron detectors. Observations of these gamma-rays and neutrons provide information about acceleration and transport of ions in solar flares. There were three solar neutron events observed by the ground-based neutron monitors in association with large solar flares on 1991 June 4, 2003 October 28, and 2005 September 7. In these events, intense gamma-ray emission, including gamma-ray lines at 0.511, 2.2, 4.4, 6.1 MeV and evidence for pion-decay radiation, was observed by the satellites. The 1991 June 4 event was observed by the CGRO/OSSE, and the 2003 October 28 and 2005 September 7 events were observed by the INTEGRAL and RHESSI satellites. Based on these gamma-ray line observations, we calculate predicted time-dependent neutron spectra arriving at Earth using the solar flare magnetic loop transport and interaction model of Hua et al. (2002). These spectra are then convolved with the response functions of the Earth's atmosphere and the neutron monitor to provide predicted neutron monitor count rates. We compare these predicted and observed rates to determine the accelerated ion spectrum and magnetic-loop transport properties.
Gros Michel
Harris Mark J.
Lin Robert P.
Murphy Ronald J.
Share Gerald H.
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