Physics
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsm71a..07m&link_type=abstract
American Geophysical Union, Spring Meeting 2009, abstract #SM71A-07
Physics
2431 Ionosphere/Magnetosphere Interactions (2736), 2455 Particle Precipitation, 2732 Magnetosphere Interactions With Satellites And Rings, 2778 Ring Current, 2788 Magnetic Storms And Substorms (7954)
Scientific paper
Global simulations of Earth's magnetosphere in the solar wind compute the pathways of plasma circulation through the plasma sheet. We address the pathways that supply and drain the plasma sheet, by coupling the LFM global circulation model with Global Ion Kinetic simulations of the outer magnetosphere and the Comprehensive Ring Current Model of the inner magnetosphere, including plasmaspheric plasmas. We find that the plasma sheet is supplied with solar wind plasmas via the magnetospheric flanks, most effectively for northward IMF. For southward IMF, the innermost plasma sheet and ring current region are directly supplied from the flanks, with an asymmetry of single particle entry favoring the dawn flank. The central plasma sheet (near midnight) is supplied, as expected, from the lobes and polar cusps, but the near-Earth supply consists mainly of slowly moving ionospheric outflows for typical conditions. Work with the recently developed multi-fluid LFM simulation shows transport via plasma "fingers" extending Earthward from the flanks, suggestive of an interchange instability. We investigate this with solar wind ion trajectories, seeking to understand the fingering mechanisms and effects on transport rates.
Damiano P.
Delcourt Dominique C.
Fedder Joel A.
Fok M. H.
Lotko William
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