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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 γ-ray observations of this flare made by Granat/PHEBUS. We compare neutron and γ-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.

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