Comparisons of Simulated and Observed Stormtime Magnetic Intensities, Ion Plasma Parameters, and ENA Proton Flux in the Ring Current During Storms

Details Comparisons of Simulated and Observed Stormtime Magnetic Intensities, Ion Plasma Parameters, and ENA Proton Flux in the Ring Current During Storms Comparisons of Simulated and Observed Stormtime Magnetic Intensities, Ion Plasma Parameters, and ENA Proton Flux in the Ring Current During Storms

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm22b..06c&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM22B-06

Physics

[2730] Magnetospheric Physics / Magnetosphere: Inner, [2753] Magnetospheric Physics / Numerical Modeling, [2778] Magnetospheric Physics / Ring Current, [2788] Magnetospheric Physics / Magnetic Storms And Substorms

Scientific paper

In this study we compare simulated and observed stormtime magnetic intensities, proton flux spectra and/or ENA fluxes for two storm events to test how well self-consistent simulations can simultaneously reproduce these quantities. We simulate the ring current and plasma sheet using the magnetically and electrostatically self-consistent Rice Convection Model-Equilibrium (RCM-E) [Lemon et al., JGR, 2004] with a time-varying magnetopause driven by upstream solar wind and interplanetary magnetic field (IMF) conditions. Using either in-situ data (e.g., LANL/MPA and SOPA) or the empirical IMF-dependent model of Tsyganenko and Mukai [JGR, 2003], we specify the plasma sheet pressure and density at 10 Earth radii as the plasma boundary location in the RCM-E. We compare the simulated magnetic intensity with the magnetic intensity measured by magnetometers on the GOES satellites at geosynchronous altitude (6.6 Earth radii) and any other available satellite. We simulate a larger (11 August 2000; minimum Dst = -106 nT) and a smaller (6 April 2010; minimum Dst = 73 nT) storm. For the 11 August 2000 storm, we compare simulated and observed proton spectra (LANL/MPA and SOPA and Polar/CAMMICE). For the more recent 6 April 2010 storm we compare simulated and observed proton spectra (THEMIS) and energetic neutral atom (ENA) flux (TWINS). We discuss the response of the ring current magnetic field and ion flux distribution to expansions and compressions of the magnetosphere associated with the dynamic solar wind pressure for these storm events.

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