Properties of a Shielding Effect in the Inner Earth Magnetosphere

Details Properties of a Shielding Effect in the Inner Earth Magnetosphere Properties of a Shielding Effect in the Inner Earth Magnetosphere

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm21a0305b&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM21A-0305

Physics

2712 Electric Fields (2411), 2730 Magnetosphere: Inner, 2753 Numerical Modeling, 2760 Plasma Convection (2463), 2778 Ring Current

Scientific paper

An electric field in the inner magnetosphere could be considered as a sum of two components. The first one ('outer'): an imposed electric field originating from the solar wind and the second ('inner'): an electric field created by ionosphere-ring current interactions. The presence of the latter component results in decrease of magnitude of imposed field at low geomagnetic latitudes. This effect is known as a shielding effect. Using self-consistent model of electric field in the inner magnetosphere (based on 'Vasyliunas loop') we performed a number of numerical experiments to study the shielding properties. The shielding is described by two different approaches: a) by a variation of a potential along a half-circle of r=L at the nightside equatorial magnetosphere; b) the extent to which plasma sheet ions are prohibited from penetration into the inner magnetosphere due to the shielding. We study the dependence of the shielding effect on proton temperature (1.8--15 keV) and concentration (0.25--2 cm-3) at a polar boundary of modeled region. The relation between two definitions of the shielding is considered.

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