Poloidal Field Line Resonances Driven by a Fast Wave

Abstract We present numerical simulations of the excitation of resonant poloidal Alfvén waves. The resulting Alfvén waves could be loosely described as “high‐” ( is the azimuthal wave number) in as much as the azimuthal scale of the wave is much less than the scale in the direction normal to ‐shells. Such waves are generally excited by wave‐particle interactions. In this article we show how resonant poloidal Alfvén waves can be excited by a fast mode (of large azimuthal scale) in a cold plasma. The key property that enables this is a three‐dimensional equilibrium, which facilitates the process of phasemixing in the azimuthal direction. We show that the classification of resonant Alfvén waves as high‐ and low‐ has limited applicability in 3D inhomogeneous media and suggest an alternative classification be based on the excitation mechanism.

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Publication Details

Journal
Geophysical Research Letters
Published
2025-02-10
DOI
https://doi.org/10.1029/2024gl111670
Citations
2
Primary Topic
Magnetic confinement fusion research
Type
article
Field-Weighted Citation Impact
3.74

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article

Poloidal Field Line Resonances Driven by a Fast Wave

Kazue Takahashi, Tom Elsden, Andrew N. Wright, I. R. Mann et al.
2 citations
Geophysical Research Letters
Magnetic confinement fusion research
3.74
article

Poloidal Field Line Resonances Driven by a Fast Wave

Kazue Takahashi, Tom Elsden, Andrew N. Wright, I. R. Mann, Alexander William Degeling, T. K. Yeoman, J. K. Sandhu, L. G. Ozeke
article en
2 citations

Abstract

Abstract We present numerical simulations of the excitation of resonant poloidal Alfvén waves. The resulting Alfvén waves could be loosely described as “high‐” ( is the azimuthal wave number) in as much as the azimuthal scale of the wave is much less than the scale in the direction normal to ‐shells. Such waves are generally excited by wave‐particle interactions. In this article we show how resonant poloidal Alfvén waves can be excited by a fast mode (of large azimuthal scale) in a cold plasma. The key property that enables this is a three‐dimensional equilibrium, which facilitates the process of phasemixing in the azimuthal direction. We show that the classification of resonant Alfvén waves as high‐ and low‐ has limited applicability in 3D inhomogeneous media and suggest an alternative classification be based on the excitation mechanism.

Geophysical Research LettersVol. 52(3)
University of Leicester (GB), Shandong University (CN), University of Alberta (CA), University of St Andrews (GB), Johns Hopkins University Applied Physics Laboratory (US)
National Aeronautics and Space Administration, National Natural Science Foundation of China, Canadian Space Agency, Natural Environment Research Council, Science and Technology Facilities Council
Openalex Percentile: Top 9%
Magnetic confinement fusion research
3.74
DOIOpen Access PDFOpenAlex
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Poloidal Field Line Resonances Driven by a Fast Wave — Kazue Takahashi, Tom Elsden, et al. · Geophysical Research Letters (2025) | TGRS Research Map | TGRS