Physics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsm42d..08y&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #SM42D-08
Physics
7831 Laboratory Studies, 7835 Magnetic Reconnection
Scientific paper
In MRX (Magnetic Reconnection Experiment), the detailed magnetic field structure and the plasma profiles of the neutral sheet have been measured and evidences for the physics beyond MHD have been obtained[1]. As the electron-ion collision frequency is reduced, the reconnection rate is observed to be significantly enhanced over the classical value. Both electrostatic and magnetic turbulence of lower hybrid frequency range has been observed in the low collisionality regime. The amplitude of magnetic fluctuation is the largest at the center of neutral sheet while the electropotential fluctuations peak at the edge of the sheath. To describe the physics of this region, much thought has been given to the `` generalized" Ohm's law where electrons and ions are separately treated to satisfy the equations of motion in the neutral sheet plasma. In this `` E-MHD" region electrons but not ions are considered to be magnetized and the lower hybrid drift wave can be connected continuously to an obliquely propagating Whistler wave[2]. In this paper we examine the entire spectrum of waves from the electron cyclotron frequency down to the ion cyclotron frequency. The electric potential fluctuations of lower hybrid frequency were measured [3] and identified as electrostatic lower hybrid drift waves [E-LHDW]. In the present study the properties of elecromagnetic waves are investigated theoretically and compared with the recent experimental data from the MRX neutral sheet plasmas[4]. Also we will discuss physical mechanisms of the enhanced resistivity induced by the electromagnetic waves including magnetic lower hybrid waves [M-LHDW] and Whistler waves. This work is supported by DoE, NASA and NSF. 1. M. Yamada et al., Phys. Plasmas, vol.7, 1781, (2000) 2. R.L. Stenzel and J.M. Urrutia, Phys. Plasmasv.7, 4450, (2000) 3. T. Carter et al., Phys. Rev. Letts. v88, 15001 (2002) 4. H. Ji et al., This meeting (2002)
Ji Hantao
Kulsrud Russell M.
Yamada Mitsuru
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