Physics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsm42d..07j&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #SM42D-07
Physics
7524 Magnetic Fields, 7831 Laboratory Studies, 7835 Magnetic Reconnection
Scientific paper
Magnetic reconnection plays an important role in determining the topology of magnetic fields in solar flares, magnetospheric substorms, and relaxation processes in laboratory plasmas. A major puzzle of magnetic reconnection is the observed reconnection rates, which are much faster than predictions by classical theories such as the Sweet-Parker model. In MRX (Magnetic Reconnection Experiment), it has been observed that reconnection happens much faster in the low collisionality regime than classically predicted rates. In order to understand the underlying mechanisms of fast reconnection, electrostatic and electromagnetic fluctuations with frequency up to 100 MHz have been measured. Previous measurements indicate that the electrostatic fluctuations, localized in space and in time, do not correlate closely with the observed fast reconnection. This paper reports detailed measurements of electromagnetic fluctuations of the lower-hybrid frequency range. Preliminary analysis indicate that magnetic fluctuations of 0.1--1% of the reconnecting field peak at the center of current sheet and they exist at only certain toroidal angles where the current sheet is broad thus the reconnection proceeds faster. In addition, these magnetic fluctuations appear to unti-correlate strongly with collisionality, an indication of close relation with fast reconnection. The detailed results on the nature of the fluctuations will be presented and theoretical implications will be discussed. This work is supported by DOE, NASA, and NSF.
Carter Thomas
Ji Hantao
Kulsrud Russell M.
Yamada Mitsuru
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