Role of periodic loading-unloading in the magnetotail versus interplanetary magnetic field Bz flipping in the ring current buildup

Details Role of periodic loading-unloading in the magnetotail versus interplanetary magnetic field Bz flipping in the ring current buildup Role of periodic loading-unloading in the magnetotail versus interplanetary magnetic field Bz flipping in the ring current buildup

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jgra..11303206t&link_type=abstract

Journal of Geophysical Research, Volume 113, Issue A3, CiteID A03206

Physics

1

Magnetospheric Physics: Magnetosphere: Inner, Magnetospheric Physics: Ring Current, Magnetospheric Physics: Numerical Modeling, Magnetospheric Physics: Substorms

Scientific paper

Introducing kinetic corrections into the to BATSRUS code in the magnetotail region leads to fast reconnection rates observed in kinetic simulations and quasi-periodic loading-unloading cycles in the magnetotail during a long period of steady southward interplanetary magnetic field (IMF) B z (Kuznetsova et al., 2006, 2007). We use the global MHD code BATSRUS output to drive the Fok Ring Current (FRC) model, which then exhibits quasi-periodic oscillations of geosynchronous energetic particle fluxes, similar to ``sawtooth'' injection profiles. We compare these results with the results of the FRC model driven by BATSRUS for periodically flipping IMF B z component, without kinetic corrections. The comparison shows the dominant role of quasi-periodic loading-unloading in the tail over the role of flipping IMF B z component in the formation of geosynchronous fluxes for various energies. This same result is confirmed by the analysis of particle number and energy content within geosynchronous orbit.

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