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[en] It is shown that a strong lower hybrid wave is modulationally unstable to perturbations propagating along its own wave vector. The instability relies critically on the finite thermal corrections to the lower hybrid dispersion relation

[en] We take the phenomenological point of view that the anomalous electron thermal conductivity produced by the nonlinear trapped electron mode should also influence the stability properties of the mode itself. Using a model equation, we show that this effect makes the mode self-stabilizing. A simple expression for the anomalous thermal conductivity is derived and its scaling properties discussed

[en] By deriving a quadratic form it is shown that resistive drift modes in a plasma slab with magnetic shear, with or without finite-β effects, are never unstable

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[en] A new collisionless dissipation mechanism which can drive tearing modes in a plasma neutral sheet is described. The new mechanism relies on the presence of a background cold plasma which leads to mode conversion into a continuous spectrum of cold plasma waves

[en] An externally applied large amplitude circularly polarized ion cyclotron wave of long wavelength propagating along the static magnetic field can drive instabilities of ion cyclotron waves and ion acoustic waves. The dispersion relation is first derived using a kinetic equation approach. Later, it is shown that the same relation can be derived on the basis of a ''K . ΔX'' analysis. The instabilities can be classified into three classes: for absolute value of k >> k₀ we have the usual purely growing instability; for absolute value of k ∼ k₀ we have the decay instability; for absolute value of k >> k₀ we have a slightly oscillatory instability which is actually the finite k₀ modification of the purely growing instability. The dependence of both, the threshold and maximum growth rates, on various parameters is discussed. The relevance of the results to the anomalous ion heating for fusion research is also pointed out. 7 refs

[en] Our present understanding of the theory of universal eigenmodes in a collisionless plasma slab with magnetic shear, is reviewed and critically examined