Surprisingly Intense Neutron Emission from a Flare behind the Limb of the Sun

Details Surprisingly Intense Neutron Emission from a Flare behind the Limb of the Sun Surprisingly Intense Neutron Emission from a Flare behind the Limb of the Sun

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...510.1011m&link_type=abstract

The Astrophysical Journal, Volume 510, Issue 2, pp. 1011-1017.

Astronomy and Astrophysics

Astronomy

17

Acceleration Of Particles, Sun: Abundances, Sun: Flares, Sun: X-Rays, Gamma Rays

Scientific paper

The Oriented Scintillation Spectrometer Experiment on board the Compton Gamma Ray Observatory observed a strong flux of neutrons from the behind-the-limb flare that occurred on 1991 June 1. This is surprising if the neutrons were produced by thin-target interactions in the Sun's corona, as is suggested by gamma-ray observations of this flare made by Granat/PHEBUS. We compare neutron and gamma-ray observations of the June 1 flare with thick-target emissions observed from a flare 3 days later, where the interactions took place in the chromosphere and photosphere. A very hard spectrum for the accelerated particles is required to account for the number of neutrons observed on June 1 if they were produced by thin-target interactions in the corona.

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