Other
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm51c..09n&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SM51C-09
Other
2744 Magnetotail, 2764 Plasma Sheet, 2788 Storms And Substorms, 7827 Kinetic And Mhd Theory, 7835 Magnetic Reconnection
Scientific paper
Observations with the spacecraft Geotail have added significantly to our knowledge of magnetic reconnection in the magnetotail. The structure and dynamics of magnetic reconnection have been studied at the MHD level. Detailed characteristics of ion and electron behaviors have been revealed with measurements of distribution functions with a high time resolution. An intriguing characteristic for ions is counterstreaming ions on the field lines that have a convection motion with a high speed. For these ions, one component moves parallel to the magnetic field and the other component moves anti-parallel to the magnetic field, and both have the same speed. These features are well reproduced in simulations for magnetic reconnection in hybrid and full particle codes. An unexpected characteristic for electrons is seen in the tail lobe-plasma sheet boundary near the reconnection site. High-energy electrons flow out of the reconnection site, while low-energy electrons flow into the reconnection site. These electrons are found to form part of the Hall current system. Furthermore, ions and electrons show motions to different directions, indicating the ion-electron decoupling. This is what is expected in the immediate vicinity of the magnetic reconnection site. Hence, various characteristics of magnetic reconnection have emerged at the kinetic level.
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