MeV Ion Anisotropies in the Vicinity of Interplanetary Shocks

Details MeV Ion Anisotropies in the Vicinity of Interplanetary Shocks MeV Ion Anisotropies in the Vicinity of Interplanetary Shocks

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusmsh53a..03r&link_type=abstract

American Geophysical Union, Spring Meeting 2007, abstract #SH53A-03

Physics

2111 Ejecta, Driver Gases, And Magnetic Clouds, 2114 Energetic Particles (7514), 2134 Interplanetary Magnetic Fields, 2139 Interplanetary Shocks, 2164 Solar Wind Plasma

Scientific paper

The anticipated signatures of interplanetary shock acceleration to be found in energetic ion anisotropies in the vicinity of interplanetary shocks include near-isotropic particle distributions consistent with of diffusive shock acceleration, "pancake" distributions indicative of shock drift acceleration, and flow reversals suggestive of a particle acceleration region passing by the observing spacecraft. In practice, while clear examples of these phenomena exist, more typically, particle anisotropies near interplanetary shocks show considerable variation in time and space, both in individual events and from event to event. We investigate the properties of MeV/n ions in the vicinity of a number of interplanetary shocks associated with the largest energetic particle events of solar cycle 23, and previous cycles, including their intensity-time profiles, anisotropies, and relationship with local solar wind structures, using observations from the IMP 8, ISEE-3, Helios 1 and 3 spacecraft. The aim is to help to understand the role of shocks in major solar energetic particle events.

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