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SynoPSIs -- Neutron Production during the 26-28 May 2012 Solar Eruptive Event

Wednesday, March 30, 2016

The purpose of this study is to search for a solar neutron event at MESSENGER that could possibly support or refute the Roelof mechanism for generating fast neutrons close to the Sun, but above the base of the corona [Roelof, 2015].  A complicated neutron event measured by the MESSENGER Neutron Spectrometer in orbit about Mercury between 26 and 28 May 2012 was identified for this purpose.  A detailed analysis of this multiplexed event presents strong evidence that it was driven by a Type-0 ICME that carried a magnetic flux rope closed at both ends to the Sun.  Solar wind plasma and magnetic fields detected using the IMPACT package of instruments aboard STEREO A provide strong evidence that a portion of this field near the leading edge of the ICME was compressed by interaction with the upstream solar wind.  This compression can then accelerate magnetically trapped SEP ions under certain conditions that are likely to be valid within the frontal portion of the ICMEs that drive forward MHD shocks in the ambient solar wind ahead of them, as observed for this event.



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