Self-consistent inner magnetosphere simulation driven by a global MHD model

Details Self-consistent inner magnetosphere simulation driven by a global MHD model Self-consistent inner magnetosphere simulation driven by a global MHD model

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jgra..11512228z&link_type=abstract

Journal of Geophysical Research, Volume 115, Issue A12, CiteID A12228

Physics

2

Magnetospheric Physics: Ring Current, Magnetospheric Physics: Magnetospheric Configuration And Dynamics, Magnetospheric Physics: Energetic Particles: Trapped, Magnetospheric Physics: Magnetic Storms And Substorms (7954), Magnetospheric Physics: Numerical Modeling

Scientific paper

We present results from a one-way coupling between the kinetic Ring Current Atmosphere Interactions Model with Self-Consistent B field (RAM-SCB) and the Space Weather Modeling Framework (SWMF). RAM-SCB obtains plasma distribution and magnetic field at model boundaries from the Block Adaptive Tree Solar Wind Roe Upwind Scheme (BATS-R-US) magnetohydrodynamics (MHD) model and convection potentials from the Ridley Ionosphere Model within SWMF. We simulate the large geomagnetic storm of 31 August 2005 (minimum SYM-H of -116 nT). Comparing SWMF output with Los Alamos National Laboratory geostationary satellite data, we find SWMF plasma to be too cold and dense if assumed to consist only of protons; this problem is alleviated if heavier ions are considered. With SWMF inputs, we find that RAM-SCB reproduces well storm time magnetosphere features: ring current morphology, dusk side peak, pitch angle anisotropy, and total energy. The RAM-SCB ring current and Dst are stronger than the SWMF ones and reproduce observations much better. The calculated field-aligned currents (FAC) compare reasonably well with 2 h averaged pictures from Iridium satellite data. As the ring current peak rotates duskward in the storm main phase, the region 2 FACs rotate toward noon, a feature also seen in observations. Finally, the RAM-SCB magnetic field outperforms both the dipole and the BATS-R-US field at Cluster and Polar spacecraft locations. This study shows the importance of a kinetic self-consistent approach and the sensitive dependence of the storm time inner magnetosphere on plasma sheet conditions and the cross polar cap potential. The study showcases the RAM-SCB capability as an inner magnetosphere module coupled with a global MHD model.

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