Energetic Particles from Corotating Interaction Regions as Observed by STEREO and ACE

Details Energetic Particles from Corotating Interaction Regions as Observed by STEREO and ACE Energetic Particles from Corotating Interaction Regions as Observed by STEREO and ACE

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsh52b..05l&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SH52B-05

Physics

2100 Interplanetary Physics, 2102 Corotating Streams, 2114 Energetic Particles (7514)

Scientific paper

Since the two STEREO spacecraft entered heliocentric orbit early in 2007 there have been no large solar energetic particle events, however significant particle enhancements due to corotating interaction regions (CIRs) have been regularly observed at 1 AU. The Low Energy Telescope (LET) on each STEREO spacecraft measures elemental composition and spectra for particles from H to Ni from ~2 to ~50 MeV/nucleon, depending on species, and provides anisotropy information for 6 different species or element groups. The Suprathermal Ion Telescope (SIT), also on STEREO, extends ion composition measurements down to lower energies of ~0.05 to 5 MeV/nucleon. As the two STEREO spacecraft move farther apart, the differences in CIR time profiles observed on each become ever greater. Delays on the order of a day are now common between the Behind and Ahead spacecraft, with different features present in the time profiles on each. Using STEREO data along with measurements from ULEIS and SIS on ACE, we present observations of H and He spectra, anisotropies, and time profiles for the CIR events of 2007. This work was supported by NASA under grants NAS5-03131 and NAG5-12929.

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