Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm31b1869v&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SM31B-1869
Physics
[2721] Magnetospheric Physics / Field-Aligned Currents And Current Systems, [2753] Magnetospheric Physics / Numerical Modeling, [2778] Magnetospheric Physics / Ring Current, [2788] Magnetospheric Physics / Magnetic Storms And Substorms
Scientific paper
We present initial simulation results of the 22 July 2009 storm obtained with OpenGGCM (global MHD model) fully coupled with the Comprehensive Ring Current Model (CRCM), which self-consistently solves the kinetic equation for ring current ions. The event was observed by both THEMIS and TWINS missions. The two-way coupling is done by implementing pressure feedback from CRCM into OpenGGCM. CRCM receives from the OpenGGCM the ionospheric potential at its outer boundary, the flux tube volume, plasma temperature and density, and several other parameters. In turn, the CRCM returns the plasma pressure and density to the OpenGGCM. In the regions where both models overlap, the CRCM plasma pressure and density are used to push the OpenGGCM pressure and density towards the respective values computed by CRCM. In these regions, the CRCM values are considered more accurate since the CRCM includes the proper particle drifts, along with the relevant loss processes. We compare our model results for the cases with and without CRCM feedback. We see a significant increase in the plasma pressure and temperature close to Earth due to the ring current model feedback, which results in a more extended near-Earth tail region plasma sheet and stronger region-2 field-aligned currents. We observe distinctive particle injections into the ring current from the tail in the low- and mid-energy range mostly after 05.00UT. Injections in the higher energy channels are observed after the Dst minimum at ~06:00UT. We find that the simulated CRCM flux is in agreement with the observations.
Angelopoulos Vassilis
Fok M. H.
Glocer A.
Goldstein Jeffrey Jay
McComas David John
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