Nonlinear evolution of lower hybrid waves

Evolution of nonlinear waves in compressing plasma

Temporal evolution of lower hybrid waves in the presence of ponderomotive density fluctuations

The propagation of lower hybrid waves in the presence of ponderomotive density fluctuations is considered. The problem is treated in two dimensions and, in order to be able to correctly impose the boundary conditions, the waves are allowed to evolve in time. The fields are described by ivτ − ∫ vξ dζ+vζζ + |v| v = 0 where v is proportional to the electric field, τ to time, and ζ and ξ measure di...

Nonlinear evolution of the lower-hybrid drift instability in a current sheet.

The lower-hybrid drift instability is simulated in an ion-scale current sheet using a fully kinetic approach with values of the ion to electron mass ratio up to m(i)/m(e)=1836. Although the instability is localized on the edge of the layer, the nonlinear development increases the electron flow velocity in the central region resulting in a strong bifurcation of the current density and significan...

Excitation and trapping of lower hybrid waves in striations

The theory of lower hybrid LH waves trapped in striations in warm ionospheric plasma in the three-dimensional case is presented. A specific mechanism of trapping associated with the linear transformation of waves is discussed. It is shown analytically that such trapping can take place in elongated plasma depletions with the frequencies below and above the lower hybrid resonance frequency of the...

Saturation of electron cyclotron maser by lower-hybrid waves

We perform a numerical study on the quasilinear relaxation of an electron cyclotron maser on the initially dominant mode. We focus thereby on a situation where the initially dominant modes are quasi-electrostatic lower hybrid (lh) waves, which have not been treated in preceding studies. To this end, we chose 0.2 ≤ ωp/ωBe < 0.5 (ωp: plasma-, ωBe: electron cyclotron frequency) and an initial loss...