Physics – Plasma Physics
Scientific paper
Jun 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.2173y&link_type=abstract
Geophysical Research Letters, Volume 28, Issue 11, p. 2173-2176
Physics
Plasma Physics
4
Magnetospheric Physics: Numerical Modeling, Magnetospheric Physics: Plasma Sheet, Space Plasma Physics: Magnetic Reconnection, Space Plasma Physics: Numerical Simulation Studies
Scientific paper
Fluid-ion dynamics from a Hall-MHD calculation and test ions that are advanced in Hall-MHD fields are compared to particle-ion dynamics from a hybrid simulation of two-dimensional reconnection in a thin current sheet. These comparisons demonstrate that off-diagonal terms of the ion pressure tensor are important to correctly model the ion out-of-plane momentum transport from the X point. These effects can be efficiently modeled in Hall-MHD simulations by advancing test ions in the Hall-MHD fields, accumulating the pressure tensor onto the spatial grid, and modifying the ion momentum equation. With ion gyro-radius corrections, the ``particle Hall-MHD'' simulation is shown to model accurately the ion out-of-plane momentum transport from the X point and the reconnection rate comparison with the hybrid simulation is improved.
Birn Joachim
Gary Peter S.
Winske Dan
Yin Luiguo
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