Drift ion-acoustic waves in a nonuniform rotating magnetoplasma with two-temperature superthermal electrons

TL;DR

This paper investigates the behavior of drift ion-acoustic waves in a nonuniform, rotating magnetoplasma with two-temperature superthermal electrons, revealing new wave modes and exact nonlinear solutions influenced by plasma parameters.

Contribution

It introduces a new wave mode coupling in nonuniform rotating plasmas and derives exact solitary and periodic solutions considering superthermal electron effects.

Findings

New wave mode depends on density gradient, rotation, and electron spectral indexes.

Exact solitary and periodic wave solutions are obtained and analyzed.

Wave properties are significantly affected by density inhomogeneity, superthermality, and rotation.

Abstract

The theory of low-frequency (in comparison with the ion cyclotron frequency), long wavelength, electrostatic drift ion-acoustic waves (IAWs) is studied in a nonuniform rotating magnetoplasma with two temperature superthermal electrons. In the linear limit, the coupling of IAWs and drift waves by the density inhomogeneity is shown to produce a new wave mode which typically depends on the density gradient, the rotational frequency and the spectral indexes of superthermal electrons. In the nonlinear regime, an evolution equation for the drift IAWs is derived by the dispersion approach, and using the Jacobi elliptic function expansion technique its exact solitary and periodic wave solutions (namely, cnoidal and dnoidal) are also obtained. The properties of these solutions are numerically examined and it is found that they are significantly modified by the effects of the background density gradient, the superthermality of electrons and the Coriolis force associated with the rotational motion of ions.