Understanding Storm-time Ring Current Sources through Data-Model Comparisons of a Moderate Storm, an Intense Storm and a Super-storm

Details Understanding Storm-time Ring Current Sources through Data-Model Comparisons of a Moderate Storm, an Intense Storm and a Super-storm Understanding Storm-time Ring Current Sources through Data-Model Comparisons of a Moderate Storm, an Intense Storm and a Super-storm

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm22a..08z&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SM22A-08

Physics

2740 Magnetospheric Configuration And Dynamics, 2753 Numerical Modeling, 2764 Plasma Sheet, 2778 Ring Current, 2788 Magnetic Storms And Substorms (7954)

Scientific paper

With the Space Weather Modeling Framework (SWMF), the moderate storm on 19 May 2002, the intense storm on 11 May 2002, and the super-storm on 20 November 2003 are simulated. In comparison with in-situ observations from Wind, Geotail, Polar, Goes8, Goes10, Goes12, LANL MPA, and measured Sym-H, simulation results are validated. It is shown that the SWMF is sophisticated enough to make quantitative data- model comparisons. The major characteristics of the three storms are successfully reproduced. Observations and modeling results match better in the outer than inner magnetosphere; they match better during the quiet than disturbed times. With different SWMF parameter settings and storm sizes, the influences on storms of upstream solar wind conditions, ionospheric outflow and ionospheric conductance are assessed. Results from `virtual satellites', placed at geosynchronous orbit in the SWMF, show that plasma temperature and entropy are asymmetric on the nightside with a peak at 7:00 - 8:00 PM local time. After the solar wind shock hits the magnetosphere, the nightside plasma becomes denser closer to dawn and dusk. Possible reasons for the number density peaks are investigated and discussed.

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