Propagating Alfvén waves in open structures with random structuring
Date
01/10/2022Funder
Grant ID
647214
ST/S000402/1
ST/W001195/1
RPG-2021-114
Metadata
Show full item recordAbstract
We consider the behaviour of Alfvén waves propagating in a medium with random density perturbations. The imposed density perturbations have a broadband spectrum and their characteristic spatial scale may be defined according to the peak in the spectrum. The interaction of the boundary driven Alfvén waves with the medium generates reflections most efficiently when their wavelength is comparable to the spatial scale of the density perturbations. For our monotonic driver, this leads to the generation of quasi-periodic oscillations. The periods of oscillation of the propagating Alfvén waves is no longer only associated with the driver. Additional periodicities may be associated with one or more characteristic spatial scales in the density profile, or with beating between other spectral components. Multiple wave reflections cause oscillatory power to be retained at low altitudes, increasing opportunities to contribute to heating at those locations.
Citation
Pascoe , D J , De Moortel , I , Pagano , P & Howson , T A 2022 , ' Propagating Alfvén waves in open structures with random structuring ' , Monthly Notices of the Royal Astronomical Society , vol. 516 , no. 2 , pp. 2181–2188 . https://doi.org/10.1093/mnras/stac2294
Publication
Monthly Notices of the Royal Astronomical Society
Status
Peer reviewed
ISSN
0035-8711Type
Journal article
Description
Funding: The research leading to these results has received funding from the UK Science and Technology Facilities Council (consolidated grant ST/N000609/1), the European Union Horizon 2020 research and innovation programme (grant agreement No. 647214). IDM received funding from the Research Council of Norway through its Centres of Excellence scheme, project number 262622.Collections
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