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Dispersive evolution of nonlinear fast magnetoacoustic wave trains
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Pascoe, D. J. (David J.), Goddard, Christopher R. and Nakariakov, V. M. (Valery M.) (2017) Dispersive evolution of nonlinear fast magnetoacoustic wave trains. Astrophysical Journal Letters, 847 (2). L21. doi:10.3847/2041-8213/aa8db8 ISSN 2041-8213.
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Official URL: https://doi.org/10.3847/2041-8213/aa8db8
Abstract
Quasi-periodic rapidly propagating wave trains are frequently observed in extreme ultraviolet observations of the solar corona, or are inferred by the quasi-periodic modulation of radio emission. The dispersive nature of fast magnetohydrodynamic waves in coronal structures provides a robust mechanism to explain the detected quasi-periodic patterns. We perform 2D numerical simulations of impulsively generated wave trains in coronal plasma slabs and investigate how the behavior of the trapped and leaky components depend on the properties of the initial perturbation. For large amplitude compressive perturbations, the geometrical dispersion associated with the waveguide suppresses the nonlinear steepening for the trapped wave train. The wave train formed by the leaky components does not experience dispersion once it leaves the waveguide and so can steepen and form shocks. The mechanism we consider can lead to the formation of multiple shock fronts by a single, large amplitude, impulsive event and so can account for quasi-periodic features observed in radio spectra.
| Item Type: | Journal Article | |||||||||
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| Alternative Title: | ||||||||||
| Subjects: | Q Science > QB Astronomy | |||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||
| Library of Congress Subject Headings (LCSH): | Astrophysics, Sun -- Corona, Solar magnetic fields, Solar activity | |||||||||
| Journal or Publication Title: | Astrophysical Journal Letters | |||||||||
| Publisher: | IOP Publishing Ltd | |||||||||
| ISSN: | 2041-8213 | |||||||||
| Official Date: | 28 September 2017 | |||||||||
| Dates: |
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| Volume: | 847 | |||||||||
| Number: | 2 | |||||||||
| Article Number: | L21 | |||||||||
| DOI: | 10.3847/2041-8213/aa8db8 | |||||||||
| Status: | Peer Reviewed | |||||||||
| Publication Status: | Published | |||||||||
| Access rights to Published version: | Restricted or Subscription Access | |||||||||
| Date of first compliant deposit: | 29 September 2017 | |||||||||
| Date of first compliant Open Access: | 31 January 2018 | |||||||||
| RIOXX Funder/Project Grant: |
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