Resonance maps for 3D Alfvén waves in a compressed dipole field

Wright, A., Degeling, A. W. and Elsden, T. (2022) Resonance maps for 3D Alfvén waves in a compressed dipole field. Journal of Geophysical Research: Space Physics, 127(4), e2022JA030294. (doi: 10.1029/2022JA030294)

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Abstract

Resonance Maps depict the possible locations and polarizations of resonant Alfvén waves (Field Line Resonances – FLRs) for a given equilibrium and driving frequency. Previously the use of Resonance Maps has been developed for gaining insight into the behavior of Alfvén waves in basic potential magnetic fields that allow the use of an orthogonal field aligned coordinate system. In more general magnetic fields these coordinates do not exist. In this paper we explore the application of Resonance Maps to such equilibria. A number of simulations of resonant Alfvén waves are presented and interpreted using the Maps. We find that Resonance Maps remain useful when some of the constructions used previously are generalised to accommodate the properties of more general magnetic fields. For example, Resonance Maps are able to predict the location and polarisation of Alfvén waves which are driven strongly by fast mode waves using a “tangential alignment condition”. Unusual properties, such as Alfvén waves crossing flux surfaces persist in the more general magnetic fields we consider.

Item Type:Articles
Additional Information:A. Wright was partially funded by the Science and Technology Facilities Council (STFC) grant (ST/N000609/1). T. Elsden is funded by a Leverhulme Trust Early Career Fellowship (ECF-2019-155) and the University of Glasgow. A. Degeling is supported by the National Natural Science Foundation of China (41774172).
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Elsden, Dr Thomas
Authors: Wright, A., Degeling, A. W., and Elsden, T.
College/School:College of Science and Engineering > School of Mathematics and Statistics > Mathematics
Journal Name:Journal of Geophysical Research: Space Physics
Publisher:Wiley
ISSN:2169-9402
ISSN (Online):2169-9402
Published Online:23 March 2022
Copyright Holders:Copyright © 2022 The Authors
First Published:First published in Journal of Geophysical Research: Space Physics 127(4): e2022JA030294
Publisher Policy:Reproduced under a Creative Commons License
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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
316787ECF TransferThomas ElsdenLeverhulme Trust (LEVERHUL)ECF-2019-155M&S - Mathematics