Dust Acoustic Solitons in Saturn\u2019s Dust-Filled Magnetosphere

S. I. Kopnin,S. I. Popel,D. V. Shokhrin

doi:10.1134/s1063780x2201007x

Abstract

The possibility is considered of propagation of localized wave structures, such as dust acoustic solitons, in the plasma of the dust-filled Saturn’s magnetosphere, which contains electrons of two sorts (hot and cold) subject to kappa distribution, ions, and charged dust grains. The ranges of possible velocities and amplitudes of the solitons are determined. Soliton solutions for different sizes and concentrations of dust grains in the dust-filled Saturn’s magnetosphere are found.

Highlights

It is difficult to imagine a plasma-filled region of the Solar system that would be free of finely dispersed dust grains [1]
Nano- and microsized dust grains are found in interplanetary space, in ionospheric and magnetospheric plasma of the planets of the Solar system, in planetary rings, in the vicinity of space bodies devoid of their own atmosphere, and so on
The possibility was shown of the propagation of localized wave structures, such as dust acoustic solitons, in the dust-filled Saturn’s magnetosphere, which includes electrons of two types, ions, and charged dust grains

Summary

INTRODUCTION

It is difficult to imagine a plasma-filled region of the Solar system that would be free of finely dispersed dust grains [1]. Measurements of the parameters of electrons in Saturn’s magnetosphere obtained by the Voyager [4, 5] and Cassini [9] missions showed the existence of two types (hot and cold) of electrons. It turned out [9] that the velocities of these electron populations are subject to the so-called kappa distribution with independent low values of κ. All of this indicates the importance of studying the nonlinear wave structures in the dusty plasma under conditions characteristic of Saturn’s magnetosphere, for which, dust acoustic waves are typical. The study is carried out for arbitrary (not small) soliton amplitudes, which appears important for interpreting future space observations

BASIC EQUATIONS

SOLITON SOLUTIONS

CONCLUSIONS

Findings

CONFLICT OF INTEREST