
ABSTRACT
Flute Instability
is of great importance in magnetically confined plasmas. It appears
in applications such as fusion energy and space physics. Our aim is
to develop a general analysis of nonlinear dynamics of driftflute waves,
applicable to arbitrary plasma beta and arbitrary spatial scales in
comparison with the ion Larmor radius. This study is of interest for
fundamental plasma theory as well as for the interpretation of Zpinch
and laboratory astrophysics experiments. Description of lowfrequency
waves and in particular drift flute waves in a high beta plasma, generally
speaking, require a kinetic approach, based on the VlasovMaxwell set
of equations. In the present work we show that the alternative twofluid
description can adequately describe the ion perturbations with arbitrary
ratio of the characteristic spatial scales to the ion Larmor radius
in socalled Pade approximation. For this purpose reduced twofluid
hydrodynamic equations, which describe nonlinear dynamics of the flute
waves with, arbitrary spatial scales and arbitrary plasma beta are derived.
The linear dispersion relation of the flute waves and the RayleighTaylor
instability are analyzed. A general nonlinear dispersion relation, which
describes generation of largescale zonal structures by the flute waves,
is presented and analyzed.

