Abstract
A review is presented of solar neutron observation by ground-based neutron monitors (NM), focusing on the five solar neutron events of 1980 June 7, 1980 June 21, 1980 November 6, 1982 November 26, and 1984 April 25 observed by the Tokyo NM. These events are analyzed by comparison with the time profiles of gamma-rays observed by the Gamma-Ray Spectrometer (GRS) on the Solar Maximum Mission (SMM) satellite and with the enhancements of counting rate observed at various NM stations in the solar neutron event of 1982 June 3.
The energy range of solar neutrons observed by the NM is estimated in each event, based on some simple assumptions, using the gamma-ray data from the GRS and decay proton data from the ISEE-3 spacecraft. It is shown that these enhancements can be almost completely explained by the continuous emission of solar neutrons for several minutes at the flare. Finally, the effective detection and the newly found possibility to predict, in the short term, the occurrence time of a solar neutron event, and the plans for observation of solar neutrons by the ground-based NM stations are presented.
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Takahashi, K. Detection of solar neutrons by ground-based neutron monitor. Space Sci Rev 51, 123–146 (1989). https://doi.org/10.1007/BF00226271
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DOI: https://doi.org/10.1007/BF00226271