Solar Neutron Event in Association with a Large Solar Flare on 2000 November 24
Author(s) -
K. Watanabe,
Y. Muraki,
Y. Matsubara,
Kazuaki Murakami,
T. Sako,
H. Tsuchiya,
S. Masuda,
M. Yoshimori,
N. Ohmori,
P. Miranda,
N. Martinić,
R. Ticona,
A. Velarde,
F. Kakimoto,
S. Ogio,
Y. Tsunesada,
H. Tokuno,
Y. Shirasaki
Publication year - 2003
Publication title -
the astrophysical journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.376
H-Index - 489
eISSN - 1538-4357
pISSN - 0004-637X
DOI - 10.1086/375685
Subject(s) - solar flare , physics , neutron , flare , gamma ray , astrophysics , spectrometer , neutron monitor , telescope , astronomy , nuclear physics , optics
Solar neutrons have been detected using the neutron monitor located at Mt.Chacaltaya, Bolivia, in association with a large solar flare on November 24,2000. This is the first detection of solar neutrons by the neutron monitor thathave been reported so far in solar cycle 23. The statistical significance ofthe detection is 5.5 sigma. In this flare, the intense emission of hard X-raysand gamma-rays has been observed by the Yohkoh Hard X-ray Telescope (HXT) andGamma Ray Spectrometer (GRS), respectively. The production time of solarneutrons is better correlated with those of hard X-rays and gamma-rays thanwith the production time of soft X-rays. The observations of the solar neutronson the ground have been limited to solar flares with soft X-ray class greaterthan X8 in former solar cycles. In this cycle, however, neutrons were detectedassociated with an X2.3 solar flare on November 24, 2000. This is the firstreport of the detection of solar neutrons on the ground associated with a solarflare with its X-ray class smaller than X8.Comment: 20 pages, 12 figures. accepted for publication in the Astronomical Journa
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