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MeV Ion Anisotropies in the Vicinity of Interplanetary ShocksThe 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.
Document ID
20070022883
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Richardson, I. G.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Cane, H. V.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
von Rosenvinge, T. T.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 23, 2013
Publication Date
May 22, 2007
Subject Category
Geophysics
Meeting Information
Meeting: American Geophysical Union 2007 Joint Assembly
Location: Acapulco
Country: Mexico
Start Date: May 22, 2007
End Date: May 25, 2007
Sponsors: American Geophysical Union
Funding Number(s)
CONTRACT_GRANT: NNG06EO90A
Distribution Limits
Public
Copyright
Other

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