Do Large Solar Energetic Particle Events Observed at 1 AU Include Particles Accelerated by the Associated Solar Flare?

Details Do Large Solar Energetic Particle Events Observed at 1 AU Include Particles Accelerated by the Associated Solar Flare? Do Large Solar Energetic Particle Events Observed at 1 AU Include Particles Accelerated by the Associated Solar Flare?

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsh33a1082v&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SH33A-1082

Physics

2139 Interplanetary Shocks, 7513 Coronal Mass Ejections (2101), 7514 Energetic Particles (2114)

Scientific paper

Many large solar energetic particle (SEP) events observed at 1 AU start with a high Fe/O ratio (measured at a fixed MeV/nucleon) that then decays to a lower value. One possible explanation is that particles in these events are a combination of flare particles, with high Fe/O, and shock accelerated particles with a lower ratio. In this scenario, one would expect that when there is good magnetic connection to the flaring region, flare particles would be detected at the start of the event. The Fe/O ratio would decrease with time to an extent dependent on the strength of the associated shock and the energy of the observations. A second possible explanation is that only shock-accelerated particles are observed, and that the time-varying Fe/O ratio is a result of escape from the shock: at a fixed MeV/nucleon, Fe particles, with their higher rigidity, escape more readily than O and therefore arrive earlier at 1 AU. Yet a third suggestion is that Fe and O have similar injection profiles near the Sun and then undergo rigidity-dependent interplanetary scattering. We will present data from the ACE Solar Ion Spectrometer (SIS) from a variety of SEP events and consider the implications for these three scenarios. We will also consider the possibility that, by combining observations from the two STEREO spacecraft and near-earth spacecraft (ACE and WIND), we may be able to rule out one or even two of these scenarios.

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