Dynamics of the Polar Cusps for Active Solar Wind Conditions: Large-scale Modeling

Details Dynamics of the Polar Cusps for Active Solar Wind Conditions: Large-scale Modeling Dynamics of the Polar Cusps for Active Solar Wind Conditions: Large-scale Modeling

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm21c..03b&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM21C-03

Physics

[2706] Magnetospheric Physics / Cusp, [2723] Magnetospheric Physics / Magnetic Reconnection, [2724] Magnetospheric Physics / Magnetopause And Boundary Layers, [2753] Magnetospheric Physics / Numerical Modeling

Scientific paper

The energy-latitude dispersion of precipitating particles observed by spacecraft near the high-latitude dayside magnetosphere offers a unique opportunity to investigate the large-scale topology and dynamics of the polar cusps. In particular, consecutive crossings of the cusps made by the Cluster spacecraft in a string of pearl configuration are particularly well suited for investigating the temporal and spatial evolution of precipitating particles as solar wind discontinuities interact with the dayside magnetopause. We present the results of large-scale simulation studies based on Cluster observations of ion dispersions following rapid changes in the direction of the interplanetary magnetic field (IMF). First, we use three-dimensional magnetohydrodynamic (MHD) simulations to follow the evolution of the global topology of the magnetic field during the events. Subsequently, the time-dependent electric and magnetic fields predicted by the MHD simulations are utilized to compute the trajectories of large samples of solar wind ions launched upstream of the bow shock. We assess the results of the studies by comparing Cluster ion measurements with ion dispersions calculated from the simulations along the spacecraft trajectories and discuss the temporal evolution and spatial extent of precipitating particles in the context of the reconnection process at the dayside magnetopause.

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