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Fast magnetoacoustic wave trains : from tadpoles to boomerangs
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Kolotkov, Dmitrii, Nakariakov, V. M. (Valery M.), Moss, Guy W. and Shellard, Paul (2021) Fast magnetoacoustic wave trains : from tadpoles to boomerangs. Monthly Notices of the Royal Astronomical Society, 505 (3). pp. 3505-3513. doi:10.1093/mnras/stab1587
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WRAP-Fast-magnetoacoustic-wave-trains-tadpoles-boomerangs-2021.pdf - Accepted Version - Requires a PDF viewer. Download (2357Kb) | Preview |
Official URL: https://doi.org/10.1093/mnras/stab1587
Abstract
Rapidly propagating fast magnetoacoustic wave trains guided by field-aligned plasma non-uniformities are confidently observed in the Sun’s corona. Observations at large heights suggest that fast wave trains can travel long distances from the excitation locations. We study characteristic time signatures of fully developed, dispersive fast magnetoacoustic wave trains in field-aligned zero-β plasma slabs in the linear regime. Fast wave trains are excited by a spatially localised impulsive driver and propagate along the waveguide as prescribed by the waveguide-caused dispersion. In slabs with steeper transverse density profiles, developed wave trains are shown to consist of three distinct phases: a long-period quasi-periodic phase with the oscillation period shortening with time, a multi-periodic (peloton) phase in which distinctly different periods co-exist, and a short-lived periodic Airy phase. The appearance of these phases is attributed to a non-monotonic dependence of the fast wave group speed on the parallel wavenumber due to the waveguide dispersion, and is shown to be different for axisymmetric (sausage) and non-axisymmetric (kink) modes. In wavelet analysis, this corresponds to the transition from the previously known tadpole shape to a new boomerang shape of the wave train spectrum, with two well-pronounced arms at shorter and longer periods. We describe a specific previously published radio observation of a coronal fast wave train, highly suggestive of a change of the wavelet spectrum from a tadpole to a boomerang, broadly consistent with our modelling. The applicability of these boomerang-shaped fast wave trains for probing the transverse structuring of the waveguiding coronal plasma is discussed.
| Item Type: | Journal Article | |||||||||
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| Subjects: | Q Science > QB Astronomy | |||||||||
| Divisions: | Faculty of Science > Physics | |||||||||
| Library of Congress Subject Headings (LCSH): | Sun -- Corona, Astrophysics, Solar magnetic fields, Stars, Magnetohydrodynamic waves, Solar atmosphere | |||||||||
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | |||||||||
| Publisher: | Oxford University Press | |||||||||
| ISSN: | 0035-8711 | |||||||||
| Official Date: | August 2021 | |||||||||
| Dates: |
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| Volume: | 505 | |||||||||
| Number: | 3 | |||||||||
| Page Range: | pp. 3505-3513 | |||||||||
| DOI: | 10.1093/mnras/stab1587 | |||||||||
| Status: | Peer Reviewed | |||||||||
| Publication Status: | Published | |||||||||
| Publisher Statement: | This is a pre-copyedited, author-produced version of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record Dmitrii Y Kolotkov, Valery M Nakariakov, Guy Moss, Paul Shellard, Fast magnetoacoustic wave trains: from tadpoles to boomerangs, Monthly Notices of the Royal Astronomical Society, 2021;, stab1587 online at:https://doi.org/10.1093/mnras/stab1587 | |||||||||
| Access rights to Published version: | Restricted or Subscription Access | |||||||||
| Copyright Holders: | © 2021 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society | |||||||||
| RIOXX Funder/Project Grant: |
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