The COMPTEL Imaging Compton Telescope on‐board the Compton Gamma Ray Observatory measured significant neutron and γ‐ray fluxes from the solar flare of 9 June 1991. The γ‐ray flux had an integrated intensity (≳1 MeV) of ∼30 cm−2, extending in time from 0136 UT to 0143 UT, while the time of energetic neutron emission extended approximately 10 minutes longer, indicating either extended proton acceleration to high energies or trapping and precipitation of energetic protons. The production of neutrons without accompanying γ‐rays in the proper proportion indicates a significant hardening of the precipitating proton spectrum through either the trapping or extended acceleration process.
AIP Conference Proceedings
Digital Object Identifier (DOI)
Neutron and gamma‐ray measurements of the solar flare of 1991 June 9 Ryan, J. and Forrest, D. and Lockwood, J. and Loomis, M. and McConnell, M. and Morris, D. and Webber, W. and Bennett, K. and Hanlon, L. and Winkler, C. and Debrunner, H. and Rank, G. and Schönfelder, V. and Swanenburg, B. N., AIP Conference Proceedings, 294, 89-93 (1994), DOI:http://dx.doi.org/10.1063/1.45205
© 1994 American Institute of Physics