Kinetic Alfven waves in inhomogeneous anisotropic dusty magnetoplasma with inhomogeneous electric field - Particle aspect analysis

Abstract

Kinetic Alfven waves in the presence of an inhomogeneous electric field perpendicular to the ambient magnetic field in inhomogeneous dusty magnetoplasma are investigated. Expression for the field-aligned current, perpendicular current (to the <i>B</i>₀), dispersion relation, particle energy and growth-rate are derived and the effect of inhomogeneous electric field is

discussed. The particle aspect approach is adopted to investigate the trajectories of charged particles in the electromagnetic field of kinetic Alfven wave in dusty magnetosphere. It is found that electric field enhances the frequency of kinetic Alfven wave for both the waves travelling towards the ionosphere and reflected by the ionosphere. Enhancement of growth rate at the particular wave number is predicted. Reduction in wave frequency and enhancement of growth rate by electric field inhomogeneity is observed. Minor effects of inhomogeneous electric field on perpendicular and parallel currents are noted. The applicability of the finding is discussed for auroral acceleration phenomena.