Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm22b..08n&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SM22B-08
Physics
2740 Magnetospheric Configuration And Dynamics, 2744 Magnetotail, 2760 Plasma Convection, 2764 Plasma Sheet, 2788 Storms And Substorms
Scientific paper
Recent observations with the spacecraft Geotail have shown that significant field transport takes place in the near- and mid-magnetotail in the substorm expansion phase and the recovery phase. Magnetic reconnection usually occurs in the mid-magnetotail (20-30 Re) in association with substorm onsets. In the near-Earth tail (inside 20 Re), significant earthward field transport takes place only just after substorm onset, and the Bz field becomes large immediately in the equatorial plane. In the mid-magnetotail (20-30 Re), earthward field transport and tailward field transport take place in the expansion phase. Just after the expansion phase, near the peak substorm activity on the ground, equatorial plasma sheet plasmas can become stationary and the Bz field remains small. In the recovery phase, earthward flows appear with a large Bz spike near the equatorial plane, sometimes sporadically. The large Bz spike often has density compression in front and a counter-streaming ion feature is embedded. This type of field transport, which is also seen in the so-called convection bay activity, is likely caused by magnetic reconnection in the distant magnetotail.
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