Multiple Cusps under Northward IMF Conditions: Observations and MHD Simulations Compared

Details Multiple Cusps under Northward IMF Conditions: Observations and MHD Simulations Compared Multiple Cusps under Northward IMF Conditions: Observations and MHD Simulations Compared

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm41b..03z&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM41B-03

Physics

2706 Cusp, 2724 Magnetopause And Boundary Layers, 2753 Numerical Modeling, 2764 Plasma Sheet, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

Multiple cusps have been observed by the Cluster spacecraft when the satellites were traveling outbound on Mar 21 and Mar 22, 2001. We conclude that multiple cusps are a temporal effect which is due to the change of the solar wind azimuthal flow (the wind sock effect). The cusp properties derived from two MHD codes, Open GGCM and BATSRUS, have been compared with the Cluster observations. We find that although the simulated magnetospheres are smaller than the real magnetosphere, the simulated magnetic fields and the amplitude of the model-derived plasma parameters (velocity, density, temperature and thermal pressure) agree well with Cluster observations. The MHD code successfully simulated the responses of the cusp positions to the solar wind azimuthal flow. This event is under northward IMF condition. The Geotail spacecraft observed the cold dense plasma when it crossed the dusk flank of the magnetotail. MHD code successfully simulated the formation of the cold sense plasma sheet on the flanks.

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