Nonlocal nonlinear electrostatic gyrofluid equations: A four-moment model

Extending a previous single-temperature model, an electrostatic gyrofluid model that includes anisotropic temperatures (T-parallel to not equal T-perpendicular to) and can treat general nonlinear situations is constructed. The model is based on a Lagrangian formulation of gyrofluid dynamics, which leads to an exact energy conservation law. Diamagnetic cancellations are inserted manually in such a way that energy conservation is preserved. Comparison with previous models shows a very good agreement for zero-Larmor-radius terms in the gyrofluid equations of motion. (c) 2005 American Institute of Physics.