Proton-Alpha Drift Instability of Electromagnetic Ion-Cyclotron Modes: Quasilinear Development

Alfven Cyclotron Instability and Ion Cyclotron Emission

Two-dimensional solutions of compressional Alfven eigenmodes (CAE) are studied in the cold plasma approximation. For finite inverse aspect ratio tokamak plasmas the two-dimensional eigenmode envelope is localized at the low magnetic field side with the radial and poloidal localization on the order of u / f i and u/*, respectively, where rn is the dominant poloidal mode number. Charged fusion pr...

Mirror instability and L-mode electromagnetic ion cyclotron instability: Competition in the Earth's magnetosheath

Growing drift-cyclotron modes in the hot solar atmosphere

Well-known analytical results dealing with ion cyclotron and drift waves and which follow from the kinetic theory are used and the dispersion equation, which describes coupled two modes, is solved numerically. The numerical results obtained by using the values for the plasma density, magnetic field and temperature applicable to the solar corona clearly show the coupling and the instability (gro...

On the competition between the mirror and electromagnetic ion cyclotron modes

We give a simple argument for the exclusive existence of mirror and electromaghetic ion cyclotron modes in anisotropic high-β plasmas. It is shown that, in addition to a large domain of coexistence of both modes, two domains exist in parameter space (A, β⊥) where solely either mirror modes or electromagnetic ion cyclotron modes can be excited. In the overlap region the modes with the larger gro...

Dispersion relation of electromagnetic ion cyclotron waves using Cluster observations

Multi-point wave observations on Cluster spacecraft are used to infer the dispersion relation of electromagnetic ion cyclotron (EMIC) waves. In this study we use a phase differencing method and observations from STAFF and WHISPER during a well-studied event of 30 March 2002. The phase differencing method requires the knowledge of the direction of the wave vector, which was obtained using minimu...