Other
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm51c..05y&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SM51C-05
Other
2724 Magnetopause, Cusp, And Boundary Layers, 2744 Magnetotail, 7831 Laboratory Studies, 7835 Magnetic Reconnection
Scientific paper
With abundant data from space satellites and the recently developed laboratory experiments, there exist many opportunities for collaborative study between space and laboratory experimental research. In this talk, we highlight the recent laboratory experimental data from the MRX device [1] in comparison with the space observations [2] as well as with the recent numerical simulations[3] addressing a major question why the observed reconnection rates are much faster than predictions by the classical theories, such as the Sweet-Parker model. There exist two leading theories for the underlying physics: one based on laminar 2D structures due to the Hall terms in the generalized Ohm's law and another based on resistivity enhancement (or the so-called anomalous resistivity) due to the inherently 3D micro-instabilities. Experimental efforts are under way to study both mechanisms in MRX, where the fast reconnection rates have been regularly observed in the low collisionality regime. A fine structure probe with spatial resolution of 1 mm (2-3 electron skin depth) is being installed. Also a special focus will be put on the electrostatic and magnetic turbulence which have recently been identified in the neutral sheet. The details of the characteristics of the turbulence measured by Hodogram probe and internal pick-up probes will be presented along with theoretical interpretations and discussions on its relation with the observed fast reconnection in space. Work supported by DOE, NASA And NSF. 1. M. Yamada et al., Phys. Plasmas 4, 1936, (1997) 2. F. Mozer et al, Phys. Rev. Letts. 15002, 1, (2002) 3. M.A. Shay et al J. Geophys. Res. 103, 9165 (1998)
Ji Hantao
Kulsrud Russell
Terry Stephen
Yamada Mitsuru
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