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Interplanetary shock-induced magnetopause motion: Comparison between theory and global magnetohydrodynamic simulations

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Title: Interplanetary shock-induced magnetopause motion: Comparison between theory and global magnetohydrodynamic simulations
Authors: Desai, RT
Freeman, M
Eastwood, J
Eggington, J
Archer, M
Shprits, Y
Meredith, N
Staples, F
Ian, R
Hietala, H
Mejnertsen, L
Chittenden, J
Horne, R
Item Type: Journal Article
Abstract: The magnetopause marks the outer edge of the Earth’s magnetosphere and a distinct boundary between solar wind and magnetospheric plasma populations. In this letter, we use global magneto-hydrodynamic simulations to examine the response of the terrestrial magnetopause to fast-forward interplanetary shocks of various strengths and compare to theoretical predictions. The theory and simulations indicate the magnetopause response can be characterised by three distinct phases; an initial acceleration as inertial forces are overcome, a rapid compressive phase comprising the majority of the distance travelled, and large-scale damped oscillations with amplitudes of the order of an Earth radius. The two approaches agree in predicting subsolar magnetopause oscillations with frequencies2–13 mHz but the simulations notably predict larger amplitudes and weaker damping rates. This phenomenon is of high relevance to space weather forecasting and provides a possible explanation for magnetopause oscillations observed following the large interplanetary shocks of August 1972 and March 1991.
Issue Date: 28-Aug-2021
Date of Acceptance: 9-Jul-2021
URI: http://hdl.handle.net/10044/1/89906
DOI: 10.1029/2021GL092554
ISSN: 0094-8276
Publisher: Wiley
Start Page: 1
End Page: 11
Journal / Book Title: Geophysical Research Letters
Volume: 48
Issue: 16
Copyright Statement: © 2021. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Sponsor/Funder: Natural Environment Research Council (NERC)
Engineering & Physical Science Research Council (EPSRC)
UKRI
Natural Environment Research Council (NERC)
Funder's Grant Number: NE/P017347/1
EP/T01735X/1
EP/T01735X/1
NE/P017142/1
Keywords: Science & Technology
Physical Sciences
Geosciences, Multidisciplinary
Geology
MHD SIMULATIONS
MAGNETIC-FIELD
ULF WAVES
MARCH 24
WIND
MAGNETOSPHERE
OSCILLATIONS
THICKNESS
MINIMUM
SPEED
physics.space-ph
physics.space-ph
astro-ph.EP
physics.plasm-ph
Meteorology & Atmospheric Sciences
Publication Status: Published
Online Publication Date: 2021-08-09
Appears in Collections:Space and Atmospheric Physics
Physics
Plasma Physics
Faculty of Natural Sciences