Abstract
A closed set of moment equations for the plasma density, velocity and pressure is proposed by imposing linear closure for the heat flux and viscosity. The formulation is valid for arbitrary finite Larmor radius parameter k⊥ρ (k⊥ is the perpendicular wave vector, ρ is the particle Larmor radius) and retains main convective nonlinearities. Reduced moment equations relevant to the drift-wave modes are derived in the low frequency limit (ω≪ωB, ωB is the particle cyclotron frequency).
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