Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm31c..04a&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SM31C-04
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 magnetospheric cusps play a key role in the entry of solar wind plasma into the Earth’s magnetosphere. The interface between the Earth’s magnetosphere and the shocked solar wind plasma in the magnetosheath maps into the cusp along the converging dipolar magnetic field. This mapping requires that the cusp be magnetically connected to the solar wind during plasma entry. We present results from a high resolution (~300km) three dimensional, local MHD simulation of a magnetic cusp configuration. We address various aspects of magnetic reconnection in the vicinity of the cusps. Specifically, we address the reconnection rate and its dependence on various solar wind parameters, as well as the response of the Cusp Diamagnetic Cavities (CDC's) to local reconnection. Additionally, we address changes in flux tube entropy through reconnection in the cusp region. The depression of the total magnetic field strength within the cusp region results in significant changes in flux tube entropy due to the inverse dependence of the flux tube entropy on the magnetic field strength. We discuss the significance of this effect in the cusp region due to the extended regions of strongly depressed magnetic field.
Adamson E. T.
Nykyri Katariina
Otto Andreas
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