Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm54a..03b&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM54A-03
Physics
2723 Magnetic Reconnection (7526, 7835), 2724 Magnetopause And Boundary Layers, 2753 Numerical Modeling, 7803 Active Perturbation Experiments
Scientific paper
It is now well established that the entry of magnetosheath plasma into the dayside magnetosphere is strongly controlled by the occurrence of magnetic reconnection at the magnetopause. While significant progress has been made in understanding the local physics involved in the reconnection process, the topology and global dynamics of the large-scale merging that takes place at the magnetopause boundary are still not well known. Determining the large-scale configuration and time evolution of the merging process is particularly important for predicting the regions of entry of magnetosheath plasma into the magnetosphere and understanding the origin of structures in the plasma precipitation and electrodynamics of the polar ionosphere. In this talk, we review recent progress in the modeling of large-scale reconnection at the dayside magnetopause. In particular, we present the results of global simulations of reconnection and ion precipitation events observed by multiple spacecraft. For each of these case studies, we first used global MHD simulations to determine the global topology of the dayside magnetosphere at different times during the events and then we investigated the topology predicted by the global MHD simulations by computing large samples of ion trajectories in the time-dependent MHD electric and magnetic fields. We examine the results of these simulations and make comparisons with observations to discuss the consequences of large-scale topology of magnetic reconnection.
Berchem Jean
Escoubet Christophe P.
Richard Robert
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