Understanding Ring Current Sources of Moderate and Intense Storms at Solar Maximum: Global Modeling Using Superposed Epoch Upstream Conditions

Details Understanding Ring Current Sources of Moderate and Intense Storms at Solar Maximum: Global Modeling Using Superposed Epoch Upstream Conditions Understanding Ring Current Sources of Moderate and Intense Storms at Solar Maximum: Global Modeling Using Superposed Epoch Upstream Conditions

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsm53a..07z&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM53A-07

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), we conduct storm simulations for superposed epoch upstream solar wind conditions of 34 moderate storms and 64 intense storms at solar maximum (July, 1999 - June, 2002). In comparison with superposed epoch averages of Dst, Sym-H, and the Los Alamos Magnetospheric Plasma Analyzer (MPA) observations at geosynchronous orbit, modeling results are validated. It is shown that the SWMF is sophisticated enough to make quantitative data-model comparisons. The major storm characteristics are successfully reproduced. With the two levels of storm intensity and different SWMF parameter settings, the influences on storms of upstream conditions, ionospheric outflow and ionospheric conductance are assessed. It is shown that the integrated energy input for a storm is much more important than the short-lived peaks in the upstream solar wind values. Consistent with the MPA averaged measurements, it is found that in the inner magnetosphere in the simulated main phase plasmas become denser near dawn than around duskside; plasma temperature is higher in the afternoon and pre-midnight sectors; but enhanced plasma pressure is always symmetric on the nightside with a peak at midnight. Possible reasons for these plasma parameter asymmetries and symmetries are investigated and discussed.
personal.umich.edu/~jichunz/

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