Characteristics of Sustained>100 MeV Gamma-ray Emission Associated with Solar Flares

@inproceedings{Share2017CharacteristicsOS,
  title={Characteristics of Sustained>100 MeV Gamma-ray Emission Associated with Solar Flares},
  author={Gerald Harvey Share and Ronald J. Murphy and A. Kimberley Tolbert and Brian R. Dennis and Stephen M. White and Richard A. Schwartz and Allan J. Tylka},
  year={2017}
}
We characterize and provide a catalog of thirty >100 MeV sustained γ-ray emission (SGRE) events observed by Fermi LAT. These events are temporally and spectrally distinct from the associated solar flares. Their spectra are consistent with decay of pions produced by >300 MeV protons and are not consistent with electron bremsstrahlung. SGRE start times range from CME onset to two hours later. Their durations range from about four minutes to twenty hours and appear to be correlated with durations… 

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TLDR
The fluence spectrum of the SEP event is very hard, indicating the presence of high-energy (GeV) particles in this event, and the durations of the SGRE event and the type II radio burst agree with the linear relationship between these parameters obtained for other SGRE events.

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