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‐m” (m 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 L‐she...
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| Format: | Article |
| Language: | English |
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Wiley
2025-02-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2024GL111670 |
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| _version_ | 1850053586603474944 |
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| author | Andrew Wright Thomas Elsden Alexander Degeling Ian R. Mann Louis Ozeke Timothy Yeoman Jasmine Sandhu Kazue Takahashi |
| author_facet | Andrew Wright Thomas Elsden Alexander Degeling Ian R. Mann Louis Ozeke Timothy Yeoman Jasmine Sandhu Kazue Takahashi |
| author_sort | Andrew Wright |
| collection | DOAJ |
| description | Abstract We present numerical simulations of the excitation of resonant poloidal Alfvén waves. The resulting Alfvén waves could be loosely described as “high‐m” (m 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 L‐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‐m and low‐m has limited applicability in 3D inhomogeneous media and suggest an alternative classification be based on the excitation mechanism. |
| format | Article |
| id | doaj-art-2f5aef0f02594d1c81498c32d31d8cef |
| institution | DOAJ |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-2f5aef0f02594d1c81498c32d31d8cef2025-08-20T02:52:30ZengWileyGeophysical Research Letters0094-82761944-80072025-02-01523n/an/a10.1029/2024GL111670Poloidal Field Line Resonances Driven by a Fast WaveAndrew Wright0Thomas Elsden1Alexander Degeling2Ian R. Mann3Louis Ozeke4Timothy Yeoman5Jasmine Sandhu6Kazue Takahashi7School of Mathematics and Statistics University of St Andrews St Andrews UKSchool of Mathematics and Statistics University of St Andrews St Andrews UKShandong Provincial Key Laboratory of Optical Astronomy and Solar‐Terrestrial Environment Institute of Space Sciences Shandong University Weihai ChinaDepartment of Physics University of Alberta Edmonton AB CanadaDepartment of Physics University of Alberta Edmonton AB CanadaSchool of Physics and Astronomy University of Leicester Leicester UKSchool of Physics and Astronomy University of Leicester Leicester UKThe Johns Hopkins University Applied Physics Laboratory Laurel MD USAAbstract We present numerical simulations of the excitation of resonant poloidal Alfvén waves. The resulting Alfvén waves could be loosely described as “high‐m” (m 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 L‐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‐m and low‐m has limited applicability in 3D inhomogeneous media and suggest an alternative classification be based on the excitation mechanism.https://doi.org/10.1029/2024GL111670field line resonanceMHD wave coupling |
| spellingShingle | Andrew Wright Thomas Elsden Alexander Degeling Ian R. Mann Louis Ozeke Timothy Yeoman Jasmine Sandhu Kazue Takahashi Poloidal Field Line Resonances Driven by a Fast Wave Geophysical Research Letters field line resonance MHD wave coupling |
| title | Poloidal Field Line Resonances Driven by a Fast Wave |
| title_full | Poloidal Field Line Resonances Driven by a Fast Wave |
| title_fullStr | Poloidal Field Line Resonances Driven by a Fast Wave |
| title_full_unstemmed | Poloidal Field Line Resonances Driven by a Fast Wave |
| title_short | Poloidal Field Line Resonances Driven by a Fast Wave |
| title_sort | poloidal field line resonances driven by a fast wave |
| topic | field line resonance MHD wave coupling |
| url | https://doi.org/10.1029/2024GL111670 |
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