Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm44b..01w&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM44B-01
Physics
2723 Magnetic Reconnection (7526, 7835), 2724 Magnetopause And Boundary Layers, 2740 Magnetospheric Configuration And Dynamics, 2753 Numerical Modeling
Scientific paper
One of the major unresolved issues for magnetospheric physics is the inclusion of the microphysics that control reconnection and the large scale signatures and structures of this reconnection. This issue is particularly important as the derived reconnection rate controls much of the dynamics of the magnetosphere, including the formation of plasmoids and flux ropes. New high-resolution (~100 km) global multi-fluid simulations are used to examine this coupling between small (ion skin depth) process and large scale (global) forcing. These simulations include finite ion cyclotron and heavy ion effects. We show that at 100 km resolution the ion structure of the magnetopause is resolved and that the region is very much more structured than lower resolution treatments. The results show movement of the magnetopause under steady IMF conditions as the current sheet responds to reconnection, flux rope generation and recovering after ejection of energetic particles. These processes lead to the quasi-periodic generation of disturbances that move both up to high latitude as well as a long the flanks of the magnetopause. It is also demonstrated that with resolution of the magnetopause current sheet the global dynamics is also modified, include the magnitude of the cross- polar cap potential and the reconnection rate in the tail. Thus small scale processes can have global consequences to the dynamics of the magnetosphere.
Harnett Erika
Winglee Robert
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