Bulk Flow Velocity and First-Order Anisotropy of Solar Energetic Particles Observed on Wind Spacecraft

Details Bulk Flow Velocity and First-Order Anisotropy of Solar Energetic Particles Observed on Wind Spacecraft Bulk Flow Velocity and First-Order Anisotropy of Solar Energetic Particles Observed on Wind Spacecraft

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh43b1515t&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SH43B-1515

Physics

7513 Coronal Mass Ejections (2101), 7514 Energetic Particles (2114), 7845 Particle Acceleration, 7851 Shock Waves (4455), 7984 Space Radiation Environment

Scientific paper

We have developed a technique to calculate the bulk flow velocity and first-order anisotropy of solar energetic particles (SEPs) with MeV per nucleon energies. Using the technique we have selected and analyzed three "gradual" SEP events recorded by the Low-Energy Matrix Telescope (LEMT) of the Energetic Particles: Acceleration, Composition, and Transport experiment (EPACT) on the Wind spacecraft. Since in our selected events, the interplanetary magnetic field upstream of interplanetary (IP) shock is nearly perpendicular to the solar-wind velocity, the effect of SEP scattering centers can be clearly discerned. From the observations of H, He, O, and Fe ions at different energies, we find that upstream of IP shock the bulk flow direction of heavy ions is opposite to that of protons. In addition, the ion velocity/rigidity dependence of the first-order anisotropy of SEPs is different between the onset and the upstream region. The implication of our observations will be discussed.

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