Determining factors for rates of magnetic reconnection in laboratory experiments

Details Determining factors for rates of magnetic reconnection in laboratory experiments Determining factors for rates of magnetic reconnection in laboratory experiments

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sm22a05y&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SM22A-05

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7831 Laboratory Studies, 7835 Magnetic Reconnection

Scientific paper

It has been long recognized that the reconnection rate is determined by the local dissipation physics as well as the global boundary conditions of reconnecting plasma, which is well described by MHD equations (with a large Lundquist number). We present here an example of experimental analysis where the both local physics and global conditions affect the reconnection rates simultaneously. Precise measurements of the neutral sheet profile can provide important clues to help understand the local physics mechanisms of reconnection. In MRX (Magnetic Reconnection Experiment [M. Yamada et al. Phys. Plasmas, v4, 1936 (1997)], the detailed magnetic field structure of the neutral sheet has been measured and some evidences for non-MHD physics mechanisms have been attained recently. We have observed fluctuations of lower hybrid frequency range[T. Carter et al., this session] in the neutral sheet in the less collision dominated regime where reconnection occurs much faster than the classical rates. A quantitative relationship is being studied. On the other hand it has been observed that the reconnection rate is determined by the downstream pressure at the neural sheet [H. Ji et al., 1998], which is influenced by the plasma's boundary conditions. It has also been measured that the presence of a bias field component slows down the reconnection rate. In this talk we review determining factors for magnetic reconnection rate by evaluating the experimental data from MRX, TS-3, and other devices.

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