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Propagating Alfven waves in open structures with random structuring
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DOI：10.1093/mnras/stac2294.png)
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We consider the behaviour of Alfven waves propagating in a medium with random density perturbations. The imposed density perturbations have a broad-band spectrum and their characteristic spatial scale may be defined according to the peak in the spectrum. The interaction of the boundary driven Alfven 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 Alfven 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.
Keyword:
MHD
Sun: atmosphere
Sun: corona
Sun: oscillations
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IF:
4.8
论文数:
7.1W
被引数:
25.0W
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