Global Observations of Flux Transfer Events and Their Effects on the Magnetosphere-Ionosphere System.

Details Global Observations of Flux Transfer Events and Their Effects on the Magnetosphere-Ionosphere System. Global Observations of Flux Transfer Events and Their Effects on the Magnetosphere-Ionosphere System.

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm12b..12m&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM12B-12

Physics

2724 Magnetopause, Cusp, And Boundary Layers, 2736 Magnetosphere/Ionosphere Interactions, 2776 Polar Cap Phenomena, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

Multi-instrument observations of the magnetosphere reveal the nature of direct coupling in the solar wind-magnetosphere-ionosphere system, namely dayside reconnection. A case study during which there was a highly favourable conjunction of an extensive array of spacebourne and ground-based instruments offered an excellent opportunity to study magnetic reconnection in situ, as well as its effects on the magnetosphere and ionosphere. Flux transfer events were observed by Geotail during an extended traversal of the dawn magnetopause. Extensive coverage of the entire dayside high-latitude ionosphere was achieved by all of the northern hemisphere SuperDARN radars, and accurate solar wind time delays were possible due to the position of the IMP8 spacecraft immediately upstream of the Earth's bow shock. The SuperDARN radars in the dawn sector, in the vicinity of Geotail's magnetic footprint, measured temporally varying convection velocities. Low-altitude satellites monitored both the size of the auroral oval and particle precipitation in the cusp footprint. Energy-dispersed cusp ions were detected by the DMSP-F11 spacecraft at the same time that an FTE was measured by the magnetically conjugate Geotail. Analysis of the field and plasma data at Geotail reveals details of the structure and motion of the newly reconnected flux tubes as they convected past the spacecraft. The implied location of magnetopause reconnection will be discussed.

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