Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-04-03
Astrophys.J. 592 (2003) 590-596
Astronomy and Astrophysics
Astrophysics
20 pages, 12 figures. accepted for publication in the Astronomical Journal
Scientific paper
10.1086/375685
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 that have been reported so far in solar cycle 23. The statistical significance of the detection is 5.5 sigma. In this flare, the intense emission of hard X-rays and gamma-rays has been observed by the Yohkoh Hard X-ray Telescope (HXT) and Gamma Ray Spectrometer (GRS), respectively. The production time of solar neutrons is better correlated with those of hard X-rays and gamma-rays than with the production time of soft X-rays. The observations of the solar neutrons on the ground have been limited to solar flares with soft X-ray class greater than X8 in former solar cycles. In this cycle, however, neutrons were detected associated with an X2.3 solar flare on November 24, 2000. This is the first report of the detection of solar neutrons on the ground associated with a solar flare with its X-ray class smaller than X8.
Kakimoto Fumio
Martinic Nicolas
Masuda Seiji
Matsubara Yoshimi
Miranda Pablo
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