Ion-kinetic D'Angelo mode

TL;DR

This paper extends the understanding of the D'Angelo mode in plasma physics into the short-wavelength, ion-kinetic regime, revealing it is driven by inverse ion Landau damping in sheared plasma flows.

Contribution

It introduces a kinetic theory extension of the D'Angelo mode, showing its excitation mechanism in short-wavelength plasma conditions.

Findings

D'Angelo mode becomes ion-kinetic at short wavelengths.

The mode is excited by inverse ion Landau damping.

It extends the hydrodynamic model to kinetic regimes.

Abstract

An extension of hydrodynamic D'Angelo mode of inhomogeneous sheared plasma flow along the magnetic field into the short-wavelength limit, where the hydrodynamic treatment is not valid, has been considered. We find that D'Angelo mode in this wavelength range is excited by inverse ion Landau damping and becomes the shear flow driven ion-kinetic mode.