Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh33b1834a&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SH33B-1834
Astronomy and Astrophysics
Astrophysics
[2151] Interplanetary Physics / Neutral Particles, [7514] Solar Physics, Astrophysics, And Astronomy / Energetic Particles, [7519] Solar Physics, Astrophysics, And Astronomy / Flares
Scientific paper
Solar energetic particle events which arise from the in-flight decay of energetic neutrons emitted from the Sun were observed in three cases during solar cycle 21. These events were associated with X-class gamma-ray solar flares occurring on the eastern hemisphere of the Sun during quiescent interplanetary conditions. The beginning of solar cycle 24 presents the opportunity to observe this kind of events from spacecraft separated in longitude and distance from the Sun. We present a Monte Carlo simulation of the propagation of solar flare neutrons and its resulting decay protons in the heliosphere. We find that the longitudinal spread of solar neutron decay protons depends on the angular distribution of solar neutrons at the Sun. We conclude that the observation of neutron decay proton events by spacecraft separated in longitude could be used to infer the degree of neutron isotropy at the Sun and constrain theoretical models of high-energy processes in solar flares.
Agueda Neus
Krucker Sa"m
Lin Robert P.
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