Multi-Spacecraft Observation of a High-Speed Flow Event at the Dayside Magnetopause for Strong IMF By: A Preliminary Study

Details Multi-Spacecraft Observation of a High-Speed Flow Event at the Dayside Magnetopause for Strong IMF By: A Preliminary Study Multi-Spacecraft Observation of a High-Speed Flow Event at the Dayside Magnetopause for Strong IMF By: A Preliminary Study

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm21b0371z&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SM21B-0371

Physics

Plasma Physics

2700 Magnetospheric Physics (6939), 2723 Magnetic Reconnection (7526, 7835), 2724 Magnetopause And Boundary Layers, 2740 Magnetospheric Configuration And Dynamics, 7800 Space Plasma Physics

Scientific paper

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.

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