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Published November 2012 | Submitted
Journal Article Open

Heliospheric Transport of Neutron-Decay Protons

Abstract

We report on new simulations of the transport of energetic protons originating from the decay of energetic neutrons produced in solar flares. Because the neutrons are fast-moving but insensitive to the solar wind magnetic field, the decay protons are produced over a wide region of space, and they should be detectable by current instruments over a broad range of longitudes for many hours after a sufficiently large gamma-ray flare. Spacecraft closer to the Sun are expected to see orders-of-magnitude higher intensities than those at the Earth-Sun distance. The current solar cycle should present an excellent opportunity to observe neutron-decay protons with multiple spacecraft over different heliographic longitudes and distances from the Sun.

Additional Information

© 2012 Springer Science+Business Media B.V. Received: 13 January 2012; Accepted: 17 July 2012; Published online: 21 August 2012. This work was supported by NASA under grants NNX08AI11G and NNX11AO75G, and subcontract SA2715-26309 from UC Berkeley under NASA contract NAS5-03131. We appreciate the assistance of R.A. Leske and C.M.S. Cohen, and discussions with R. Murphy. We also thank the anonymous reviewer for a number of helpful comments and suggestions.

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August 22, 2023
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