Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm51a1383o&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM51A-1383
Physics
2723 Magnetic Reconnection (7526, 7835), 2724 Magnetopause And Boundary Layers, 2740 Magnetospheric Configuration And Dynamics
Scientific paper
We use global 2.5-D hybrid (kinetic ions, fluid electrons) simulations to investigate the interaction of FTEs with the cusp during periods of southward IMF. The results show the formation of FTEs at low latitudes and their evolution as they subsequently move to higher latitudes and reach the cusp. The FTEs generally remain intact during their motion to high latitudes, with core regions that are typically associated with enhanced plasma densities. Typical scale sizes range from hundreds to thousands of km, with variable density enhancements. Upon reaching the high latitude magnetopause, FTEs interact with the cusp through a number of processes that will be discussed in detail. The strength of the interaction varies with the size of the FTE and it leads to particle flux enhancements within the exterior and interior cusp, suggesting that the interaction is important in the transfer of solar wind plasma into the dayside magnetosphere. The particle flux enhancements may be related to previously-reported poleward-moving auroral forms observed by all-sky imagers at cusp-latitudes near geomagnetic noon. The results show that while some larger FTEs survive passage through the cusp, the majority disintegrate as a result of interaction with the cusp. The larger FTEs shrink during their traversal of the cusp and ultimately disintegrate afterwards. Thus, we expect that few if any FTEs should be found tailward of the cusp during periods of southward IMF. This is consistent with the paucity of reported FTEs on the high- latitude magnetopause.
Omidi Nojan
Sibeck David
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