Magnetopause displacements: The possible role of dust

TL;DR

This paper proposes that dust streams from comets, asteroids, or meteoroids can cause significant, temporary displacements of Earth's magnetopause by exerting additional pressure, leading to global magnetospheric deformations.

Contribution

It introduces the novel idea that dust encounters can explain large magnetopause compressions, highlighting a potential new factor in magnetospheric dynamics.

Findings

Dust streams can induce large magnetopause displacements.

Dust grain mass and momentum significantly influence magnetopause shape.

Dust-related effects may account for observed magnetospheric variations.

Abstract

Large compressions of the magnetopause are proposed to occasionally result from temporary encounters of the magnetosphere with dust streams in interplanetary space. Such streams may have their origin in cometary dust tails or asteroids which cross the inner heliosphere or in meteoroids in Earth's vicinity. Dust ejected from such objects when embedding the magnetosphere for their limited transition time should cause substantial global deformations of the magnetopause/magnetosphere due to the very large dust grain mass and momentum which compensates for the low dust density when contributing to the upstream pressure variation.