Physics – Plasma Physics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm23c..03p&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #SM23C-03
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
Coordinate Double Star and Cluster measurements have brought new results concerning the physics of the magnetopause. We can see for the first time, the evolution of structures at small scales within the Cluster tetrahedron, and then at large scales with Cluster and Double Star conjunction. This paper presents a part of Double Star and Cluster observations of magnetic reconnection at the dayside magnetopause by introducing a few interesting events. These include: (a) TC-1 observations of the magnetic shear angle across the magnetopause near/at the reconnection site which was considerably smaller than 180 degree and observations of noticeable guide field near/in the diffusion region. (b) TC-1 observations of magnetic reconnection at the dayside low-latitude magnetopause for northward IMF when a strong By component exists. (c) Observations of plasma jets simultaneously at the subsolar point and near the cusp, suggesting that reconnection is preferentially initiated near the subsolar point and then propagates to the high-latitudes. (d) Almost simultaneous observations of an FTE by Cluster and TC-1 at different positions of the flux rope. This allows us to infer the large-scale configuration of the reconnected magnetic tube near the dayside magnetopause. (e) Simultaneous multi-spacecraft observations of reconnection signatures by Cluster at the northern high-latitude magnetopause, TC-1 in the low-latitude region and TC-2 in the southern low-altitude cusp, together with IMAGE in the southern hemisphere. The possible implications of these observations are discussed. New challenges to the present theories of magnetic reconnection and magnetopause reconnection models are addressed.
Dunlop Malcolm
Liu Zhiyi
Pu Zhang
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