HR: 0800h
AN: SM21B-0371    [Abstracts]
TI: Multi-Spacecraft Observation of a High-Speed Flow Event at the Dayside Magnetopause for Strong IMF By: A Preliminary Study
AU: * Zhang, X
EM: zhangxg@pku.edu.cn
AF: School of Earth and Space Sciences, Peking University, No. 5, Yiheyuan Street, Beijing, 100871 China
AU: Pu, Z
EM: zypu@pku.edu.cn
AF: School of Earth and Space Sciences, Peking University, No. 5, Yiheyuan Street, Beijing, 100871 China
AU: Cao, X
SM21B-0371 AF: School of Earth and Space Sciences, Peking University, No. 5, Yiheyuan Street, Beijing, 100871 China
AU: Wei, Y
SM21B-0371 AF: Institute of Geology and Geophysics,CAS, Qijiahuozi, Beijing, 100029 China
AU: Fu, S
SM21B-0371 AF: School of Earth and Space Sciences, Peking University, No. 5, Yiheyuan Street, Beijing, 100871 China
AU: Xiao, C
SM21B-0371 AF: National Astronomical Observatories, CAS, No. 20, Datun Street, Beijing, 100012 China
AU: Wang, X
SM21B-0371 AF: CAST, Dalian University of Technology, No. 2, Linggonglu Street, Dalian, 116024 China
AU: Dunlop, M
SM21B-0371 AF: Space Sciences Division,RAL,Oxford, Chilton, Didcot, Oxon, OX11 0QX United Kingdom
AU: Zong, Q
SM21B-0371 AF: CSP, Boston University, 725 Commonwealth Avenue, Boston, 02215 United States
AU: Liu, Z
SM21B-0371 AF: CSSAR, CAS, No. 1, Nanertiao,Zhongguancun, Beijing, 100080 China
AU: Carr, C
SM21B-0371 AF: The Blackett Laboratory, Imperial College, Prince Consort Road, London, SW7 2BZ United Kingdom
AU: Glassmeier, K
SM21B-0371 AF: IGM, TU Braunschweig, Mendelssohnstr. 3, Braunschweig, D-38106 Germany
AU: Reme, H
SM21B-0371 AF: CESR, 9 Avenue du Colonel Roche, Toulouse, F-31028 France
AU: Fazakerley, A
SM21B-0371 AF: MSSL, Holmbury St. Mary, Dorking, Surrey, RH5 6NT United Kingdom
AB: At about 0330UT on February 23, 2005, Cluster was located at about (9.0,1.6,7.0)Re(GSM); the GSM locations of Double Star TC-1 and TC2 at 0430UT were about (10.4,0.4,2.1)Re and about (0.5,0.1,-1.4)Re in the low-altitude cusp, respectively. Inside the dayside magnetosheath close to the magnetopause, Bx was about 0, Bz was positive with the maximum being less than 20nT, and By=-50nT. During 0320-0340 Cluster four spacecraft were traversing through the magnetopause and observed pronounced plasma flow in the magnetospheric boundary layer. The flow speed was over 370 km/s, much higher than the background magnetosheath flow and directed poleward and duskward. Preliminary analysis shows that this high-speed flow may possibly manifest a reconnection event. In the meantime, TC-1 at the low-latitude also observed high-speed flow when the satellite entered the LLBL for a short time interval. The flow was basically along the +y-direction and much higher than the background magnetosheath flow. Interesting enough, just within the time period of Cluster measurement of high-speed flow, the IMAGE FUV observed both proton and electron aurora brightening on the duskside of polar ionosphere. One hour later around 0440UT, TC-1 was crossing the magnetopause from the magnetosphere toward the magnetosheath. The spacecraft encountered with high-speed flow in the LLBL and an FTE in the magnetosheath. Of particular interest are the facts that just in the time period of TC-1 observation of high-speed flow, TC-2 detected sharp energetic electron enhancements and the IMAGE FUV also saw both proton and electron aurora brightening on the duskside of polar ionosphere. In addition, TC-2 also detected an energetic electron burst at the time when TC-1 encountered the FTE. Implications of this multi-spacecraft observation of a high-speed flow event are discussed in this paper. The possible global reconnection pattern at the dayside magnetopause is also contemplated.
DE: 2700 MAGNETOSPHERIC PHYSICS (6939)
DE: 2723 Magnetic reconnection (7526, 7835)
DE: 2724 Magnetopause and boundary layers
DE: 2740 Magnetospheric configuration and dynamics
DE: 7800 SPACE PLASMA PHYSICS
SC: SPA-Magnetospheric Physics [SM]
MN: Fall Meeting 2005