NDLI: THE RELATIONSHIP BETWEEN SOLAR FLARE GAMMA-RAY EMISSION AND NEUTRON PRODUCTION

Content Provider	Springer Nature Link
Author	Lockwood, J. A. Debrunner, H. Ryan, J. M.
Copyright Year	1997
Abstract	We have examined six solar neutron events measured by satellite instruments and/or neutron monitors (NM) to understand the relationship between the intensity–time profiles of the γ-ray lines, the pion-related γ-rays, and the neutron production. In all six events the solar neutron production was clearly time-extended. We find that neutron emission as detected by NMs most closely follows the emission of pion-related γ-rays, whereas lower energy neutron production may follow that of nuclear γ-ray line emissions. Although this distinction is not unexpected, it is safe to say that the 2.223 MeV γ-ray line from neutron capture on hydrogen is a poor measure of the neutron production at energies >200 MeV. During the three events on 1982, June 3, 1990, May 24 and 1991, June 4 solar neutrons with energies greater than 200 MeV were recorded by NMs. The NM increases on 1982, June 3 and 1990, May 24 can be modeled using the time profile of the pion-related γ-rays. For the 1991, June 4 event the NM signal was small but lasted for ∼60 min and the high-energy γ-ray data available to us are insufficient to conclude unambiguously that the high-energy neutron production followed the pion-related γ-rays. In the other three events on 1991, June 9, 11, and 15 solar neutrons with energies 10–100 MeV were observed by the COMPTEL γ-ray instrument on the Compton Gamma Ray Observatory. The duration of the low-energy neutron production on 1991, June 9 corresponded clearly to the high-energy and not to the low-energy γ-ray emission.
Starting Page	151
Ending Page	176
Page Count	26
File Format	PDF
ISSN	00380938
Journal	Solar Physics
Volume Number	173
Issue Number	1
e-ISSN	1573093X
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	1997-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Astrophysics
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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