Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sm52d01s&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SM52D-01 INVITED
Physics
2455 Particle Precipitation, 2736 Magnetosphere/Ionosphere Interactions, 2740 Magnetospheric Configuration And Dynamics, 2744 Magnetotail, 2760 Plasma Convection
Scientific paper
Identifying the processes that supply plasma to the magnetosphere has been one of the outstanding problems in magnetospheric physics. While it is well known that both the solar wind and ionospheric plasmas are important contributors to magnetospheric plasmas, there has been much debate about their relative contribution and supply processes. Since the lobe/mantle region is one of the main transport routes of both magnetosheath plasma that has entered through the magnetopause and ionospheric plasma that has flowed out from the polar ionosphere, investigation of plasma properties in the lobe/mantle is quite important to understand the configuration and dynamics of the entire magnetosphere. The discovery of tailward-flowing O+ beams by GEOTAIL in the distant lobe/mantle shed new light upon plasma supply mechanisms to the magnetotail, since their location up to the large geocentric distances ( ~210 RE) and energy of 3.4 keV on average are not explicable with a conventional view of magnetospheric dynamics. In this paper, I would like to review the recent progress in the study of the origin and dynamics of the lobe/mantle ion flows and their implications to the plasma supply mechanisms to the magnetotail. Analyses of data of the GEOTAIL spacecraft take a leading part of the study, while model calculations and the comparison of the FAST and GEOTAIL data are also utilized. The results show that plasma circulates from the dayside magnetosphere to the magnetotail due to dayside reconnection, and can play an important role in the plasma supply to the lobe/mantle in addition to conventional supply processes: the direct entry of dayside polar ionospheric outflows in the near-Earth regions and magnetosheath plasma entry through the magnetopause.
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