HR: 0800h
AN: SM21B-0367    [Abstracts]
TI: Storm-time Outflow of Ionospheric Ions and Related Convection Shear and Particle Precipitation
AU: * Ma, S
EM: syma@whu.edu.cn
AF: Institute of Ionosphere and Magnetosphere, College of Electronic Information, Wuhan University, Luojia Hill, Wuchang District, Wuhan, HB 430079 China
AU: Dang, G
SM21B-0367 AF: Institute of Ionosphere and Magnetosphere, College of Electronic Information, Wuhan University, Luojia Hill, Wuchang District, Wuhan, HB 430079 China
AU: Huo, L
SM21B-0367 AF: Institute of Ionosphere and Magnetosphere, College of Electronic Information, Wuhan University, Luojia Hill, Wuchang District, Wuhan, HB 430079 China
AU: Xu, L
EM: lix0413@whu.edu.cn
AF: Institute of Ionosphere and Magnetosphere, College of Electronic Information, Wuhan University, Luojia Hill, Wuchang District, Wuhan, HB 430079 China
AU: Schlegel, K
EM: schlegel@linmpi.mpg.de
AF: Max-Planck-Institut fuer Sonnensystemforschung (MPS) , Katlenburg-Lindau, Northeim, D-37191 Germany
AB: With coordinate data analysis of in-situ satellite FAST measurements of particle and field, measurements from DMSP IDM and RPA, along with auroral UV image from POLAR and ground-based radar, an investigation is made on the features of ion up-flowing (including both of bulk and conic/beam flow) during some major magnetic storms with minimum Dst less than -200nT between 1998 to 2003. The morphologic characteristics of strong ion upflow versus MLT and MLAT are presented. Close relationship of large O+ upflow with large shear of plasma convection are exampled for typical cases. Attention is also paid to the relationships between large O+ up-flowing fluxes with strong soft electron precipitation, field-aligned electrical field and currents, respectively. It is confirmed that dayside cusp/cleft is a very important region of storm-time ionospheric O+ up-flowing, but not the unique dominant one. In most cases large out-flowing of energetic oxygen O+ from dawn sector ionosphere is preponderant during the main phase of magnetic storm, but not true for all storms. A large part of O+ upflow bursts occur near the poleward edge of strong aurora activity region, mapping into magnetospheric boundary layers such as LLBL, BPS, cusp/cleft. At the topside ionosphere, large bulk ion upflowing are associated closely with strong convection shear or abnormal large convection self. Besides, large upper ionospheric bulk upflowing are often observed at very low latitude edge of twisted dusk convection cell during storm main phase; its relation with O+ in the storm-time ring current is worthy of further study.
UR: http://www.whu.edu.cn
DE: 2407 Auroral ionosphere (2704)
DE: 2431 Ionosphere/magnetosphere interactions (2736)
DE: 2451 Particle acceleration
DE: 2463 Plasma convection (2760)
DE: 2788 Magnetic storms and substorms (7954)
SC: SPA-Magnetospheric Physics [SM]
MN: Fall Meeting 2005