Buildup of the Ring Current During Periodical Loading-Unloading Cycle in the Magnetotail Driven by the Steady Southward IMF

Details Buildup of the Ring Current During Periodical Loading-Unloading Cycle in the Magnetotail Driven by the Steady Southward IMF Buildup of the Ring Current During Periodical Loading-Unloading Cycle in the Magnetotail Driven by the Steady Southward IMF

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsm43b..04t&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM43B-04

Physics

2778 Ring Current

Scientific paper

During prolonged intervals of negative IMF Bz the magnetosphere often enters a state in which quasi-periodic, large-amplitude oscillations of energetic particle fluxes are observed at the geosynchronous orbit. We will employ the Fok Ring Current Model and Comprehensive Ring Current Model (CRCM) to investigate the buildup of the ring current driven by the global MHD code BATSRUS during a long period of steady southward IMF. Previous simulations of such events demonstrated flat behavior of the energetic particle fluxes after the initial injection. Periodical north/south IMF turning was required to reproduce oscillations in particle fluxes at geosynchronous orbit. In the present study we will use a global MHD code that reproduces fast magnetotail reconnection rates observed in kinetic simulations. This results in periodical loading-unloading cycles in the magnetotail even for steady soutward Bz and can explain quasi-periodic oscillations of geosynchronous energetic particle fluxes.

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