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Interaction of a neutral cloud moving through a magnetized plasmaCurrent collection by outgassing probes in motion relative to a magnetized plasma may be significantly affected by plasma processes that cause electron heating and cross field transport. Simulations of a neutral gas cloud moving across a static magnetic field are discussed. The authors treat a low-Beta plasma and use a 2-1/2 D electrostatic code linked with the authors' Plasma and Neutral Interaction Code (PANIC). This study emphasizes the understanding of the interface between the neutral gas cloud and the surrounding plasma where electrons are heated and can diffuse across field lines. When ionization or charge exchange collisions occur a sheath-like structure is formed at the surface of the neutral gas. In that region the crossfield component of the electric field causes the electron to E times B drift with a velocity of the order of the neutral gas velocity times the square root of the ion to electron mass ratio. In addition a diamagnetic drift of the electron occurs due to the number density and temperature inhomogeneity in the front. These drift currents excite the lower-hybrid waves with the wave k-vectors almost perpendicular to the neutral flow and magnetic field again resulting in electron heating. The thermal electron current is significantly enhanced due to this heating.
Document ID
19910008415
Document Type
Conference Paper
Authors
Goertz, C. K. (Iowa Univ. Iowa City, IA, United States)
Lu, G. (Iowa Univ. Iowa City, IA, United States)
Date Acquired
September 6, 2013
Publication Date
December 1, 1990
Publication Information
Publication: NASA, Marshall Space Flight Center, Current Collection from Space Plasmas
Subject Category
PLASMA PHYSICS
Funding Number(s)
CONTRACT_GRANT: NSF ATM-84-11311
CONTRACT_GRANT: NSG-7632
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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IDRelationTitle19910008400Analytic PrimaryCurrent Collection from Space Plasmas