Gamma rays from an ``over-the-limb'' flare

Computer Science

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Scientific paper

We present observations taken with the SMM Gamma-Ray Spectrometer of a giant flare that occurred on 1989 September 29 at a position located approximately 10° beyond the solar limb. The spectral measurements show a rich gamma-ray spectrum with a remarkably strong neutron capture line at 2.22 MeV. We briefly examine several possible interpretations of the measurements. We conclude that the best interpretation is that the gamma-ray emission had a spatially extended component which subtended more than 30° on the solar surface in addition to the spatially compact component that normally dominates the total flare fluence. We suggest that the ``back diffusion'' of solar energetic particles resident on open field lines may have generated the extended component.

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