Physics
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsh41b..02l&link_type=abstract
American Geophysical Union, Spring Meeting 2008, abstract #SH41B-02
Physics
2102 Corotating Streams, 2114 Energetic Particles (7514)
Scientific paper
Since the two STEREO spacecraft entered heliocentric orbit early in 2007, significant particle enhancements due to corotating interaction regions (CIRs) have been regularly observed at 1 AU. As the two STEREO spacecraft move farther apart, the differences in CIR time profiles observed on each become ever greater. Delays of several days are now common between the Behind and Ahead spacecraft, with different features present in the time profiles on each. Using data from the Low Energy Telescope (LET) and the Suprathermal Ion Telescope (SIT) on STEREO 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 and 2008. In particular, we examine the evolution of the time profiles as a function of spacecraft separation in longitude, radius, and heliographic latitude, and investigate the dependence of the timing differences on the location of solar and heliospheric structures such as the heliospheric current sheet and coronal hole boundaries. This work was supported by NASA grants NAS5-03131 and NAG5-12929.
Cohen M. C.
Cummings Alan C.
Labrador Allan Wayne
Leske Richard A.
Mason Glenn M.
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