Other
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006spd....37.2905w&link_type=abstract
American Astronomical Society, SPD meeting #37, #29.05; Bulletin of the American Astronomical Society, Vol. 38, p.256
Other
Scientific paper
We have successfully detected very strong solar neutron signals in association with a solar flare occurred on 2005 September 7. Observations were made with the Solar Neutron Telescopes (SNTs) located at Mt. Chacaltaya in Bolivia (292.0E, 16.2S, 5250m a.s.l.), Mt. Sierra Negra in Mexico (262.7E, 19.0N, 4580m a.s.l.), Neutron Monitors (NMs) at Chacaltaya and Mexico City (260.8E, 19.3N, 2274m a.s.l.). The Chacaltaya NM recorded the strongest excess reaching more than 40 sigma statistical significance. The other detectors also recorded more than 10 sigma clear signals. This is the first time that the SNTs recorded spectral information in their various energy threshold channels.In this flare, intense emission of hard X-rays and gamma-rays have been observed by the GEOTAIL and INTEGRAL satellites. By the INTEGRAL satellite, 4.4 MeV line gamma-rays of de-excited C ions was observed. It seems that solar neutrons were produced at the same time as the production time of these hard electro magnetic radiations. The estimated neutron intensity at the Sun is 5.6×1027(E/100 MeV)-3.8MeV-1sr-1, assuming an instantaneous emission. The amplitudes of the observed signals are well explained with this intensity. We also found an apparent discrepancy between the observed and the expected time profiles. This fact suggests a possible extended neutron emission or changing spectrum during emission.In this paper, we report these solar neutron events and describe analysis results.
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