Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm54a..03l&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM54A-03
Physics
2724 Magnetopause And Boundary Layers, 2728 Magnetosheath, 2740 Magnetospheric Configuration And Dynamics, 2784 Solar Wind/Magnetosphere Interactions
Scientific paper
In the near-Earth environment, strong bulk plasma accelerations are frequently taken to be the diagnostic of the occurrence of magnetic reconnection. In this paper, we report new spacecraft observations and corresponding magneto-hydrodynamic (MHD) simulation of strong bulk plasma acceleration in the terrestrial magnetosheath during high Alfven speed (low density, enhanced magnetic field) solar wind conditions, which is demonstrably not associated with magnetic reconnection. We illustrate this effect with Cluster spacecraft data that show plasma acceleration to speeds higher than 1000 km/s, while the ambient solar wind speed is only 650 km/s. Based on a comparison with a global MHD simulation of the magnetosphere, we show that the acceleration results from an effective magnetic slingshot effect due to enhanced magnetic forces exerted on the plasma by stiff magnetic flux tubes.
Borovsky Joseph E.
Fazakerley Andrew N.
Lavraud Benoit
Lucek Elisabeth A.
Pogue E.
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