Wake effects of a stationary charged grain in streaming magnetized ions

TL;DR

This study uses numerical simulations to analyze how a magnetic field affects the wake potential and ion density around a stationary charged grain in streaming magnetized ions, revealing significant modifications in plasma behavior.

Contribution

It provides a comprehensive numerical analysis of magnetic field effects on wake potential and ion density distribution for various flow regimes, including the impact of charge-exchange collisions.

Findings

Magnetic field suppresses wake potential amplitude.

Ion focus depletion occurs behind the grain with magnetic influence.

Ion accumulation near the grain varies with flow regime.

Abstract

A systematic numerical study of wake potential and ion density distribution of a single grain in streaming ions under the influence of the magnetic field applied along flow is presented. Strong magnetic field introduces ion focus depletion behind grain facilitating the entrance of electrons far away in the downstream towards the grain. It is shown that the magnetic field suppresses the amplitude of wake potential and modifies the ion density distribution substantially. The wake peak potential and position characteristics, and density distribution of plasma constituents in the presence of magnetic field and charge-exchange collisions for the subsonic, sonic, and supersonic regime is also delineated. In the subsonic regime, simulations demonstrate the accumulation of ions near dust grain in the transverse direction while complete suppression of oscillations in the transverse direction takes place for sonic and subsonic regime.