HR: 0800h
AN: NG21B-0521    [Abstracts]
TI: Nonlinear finite-Larmor-radius effects in reduced fluid models
AU: * Brizard, A J
EM: abrizard@smcvt.edu
AF: Saint Michael's College, Department of Chemistry and Physics Saint Michael's College, Box 254, One Winooski Park, Colchester, VT 05439, United States
AU: Denton, R E
EM: Richard.E.Denton@dartmouth.edu
AF: Dartmouth College, Department of Physics and Astronomy, 6127 Wilder Lab, Hanover, NH 03755, United States
AU: Lotko, W
EM: william.lotko@Dartmouth.EDU
AF: Dartmouth College, Thayre School of Engineering, 8000 Cummings Hall, Hanover, NH 03755, United States
AU: Rogers, B
EM: rogers@endurance.dartmouth.edu
AF: Dartmouth College, Department of Physics and Astronomy, 6127 Wilder Lab, Hanover, NH 03755, United States
AB: The polarization and magnetization effects associated with the process of dynamical reduction leading to nonlinear gyrokinetic theory [1] are shown to introduce nonlinear finite-Larmor-radius (NFLR) effects into nonlinear reduced-fluid equations [2]. These intrinsically nonlinear FLR effects, which are associated with the transformation from guiding-center phase-space dynamics to gyrocenter phase-space dynamics, are different from standard FLR corrections, which are associated with the transformation from particle phase-space dynamics to guiding-center phase-space dynamics. The reduced fluid equations with NFLR corrections are derived from a variational principle and, thus, automatically possess an exact energy conservation law. Simulation results show agreement with linear theory, nonlinear energy conservation, and mode coupling of Alfven and sound waves.
DE: 2704 Auroral phenomena (2407)
DE: 2752 MHD waves and instabilities (2149, 6050, 7836)
DE: 7827 Kinetic and MHD theory
DE: 7833 Mathematical and numerical techniques (0500, 3200)
SC: Nonlinear Geophysics [NG]
MN: 2007 Fall Meeting