Other
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm32a0805w&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SM32A-0805
Other
2463 Plasma Convection, 2724 Magnetopause, Cusp, And Boundary Layers, 2736 Magnetosphere/Ionosphere Interactions, 2753 Numerical Modeling
Scientific paper
As magnetosheath plasma crosses the magnetopause, there is strong evidence that it can penetrate deep into the magnetosphere. Such penetration includes the presence of a cold-dense stagnant population of ions typically observed several Earth radii (Re) from the nominal position of the magnetopause. Because of the large displacement from the magnetopause this population called the cold-dense plasma sheet (CDPS) is thought to be distinct from the low latitude boundary layer (LLBL). The penetration of this magnetosheath plasma is model by means of single particle trajectories that used the magnetic and electric fields from multi-fluid global modeling of the magnetosphere. The global allows a self-consistent treatment of the interaction of ionospheric and solar wind plasmas. The particle trajectories provide information on the evolution of the local particle distributions. It is shown that velocity filtering, i.e. the relative motion of fast and slow particles along field lines plays a very important role in the formation of the CDPS, with the faster particles in the LLBL rapidly moving down the tail while the slower particles have time to convect into the mid-tail region. These cold ions are inefficiently heated by current sheet acceleration processes since their gyro-radius remains small relative to the current sheet thickness. As a consequence, the cold ions can have a long lifetime in the magnetosphere. On the other hand, ionospheric plasma experiences centrifugal acceleration that enables them to reach the tail region, and because of this initial energization that experience addition current sheet acceleration to be the dominant hot component away from the LLBL.
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