HR: 0800h
AN: SM21A-0305    [Abstracts]
TI: Properties of a Shielding Effect in the Inner Earth Magnetosphere
AU: * Buzulukova, N
EM: nbuzulukova@gmail.com
AF: NASA GSFC, 8800 Greenbelt Road, Bld.21, Greenbelt, MD 20770, United States
AU: * Buzulukova, N
EM: nbuzulukova@gmail.com
AF: Space Research Institute (IKI), Profzoyuznaya str. 84/32, Moscow, 117997, Russian Federation
AU: Petrukovich, A
EM: apetruko@iki.rssi.ru
AF: Space Research Institute (IKI), Profzoyuznaya str. 84/32, Moscow, 117997, Russian Federation
AU: Vovchenko, V
EM: a1246@rambler.ru
AF: Space Research Institute (IKI), Profzoyuznaya str. 84/32, Moscow, 117997, Russian Federation
AB: 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.
DE: 2712 Electric fields (2411)
DE: 2730 Magnetosphere: inner
DE: 2753 Numerical modeling
DE: 2760 Plasma convection (2463)
DE: 2778 Ring current
SC: SPA-Magnetospheric Physics [SM]
MN: 2007 Fall Meeting