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Fast magnetoacoustic wave trains with time-dependent drivers
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Goddard, Christopher R., Nakariakov, V. M. (Valery M.) and Pascoe, D. J. (David J.) (2019) Fast magnetoacoustic wave trains with time-dependent drivers. Astronomy & Astrophysics, 624 . L4. doi:10.1051/0004-6361/201935401 ISSN 0004-6361.
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Official URL: http://dx.doi.org/10.1051/0004-6361/201935401
Abstract
Context
Frequent observations of quasi-periodic rapidly-propagating wave trains in coronal structures have been made in the last decade. The dispersive evolution of fast magnetohydrodynamic waves propagating in coronal waveguides can provide a physical interpretation for many of these observations.
Aims
Previous studies have considered the generation of fast wave trains by impulsive drivers which deposit energy instantaneously. The signatures of dispersively formed wave trains must depend on the temporal nature of the driver. We investigate the effect of varying the temporal width of the driving perturbation.
Methods
2D magnetohydrodynamic numerical simulations of impulsively generated wave trains in a guiding field-aligned density enhancement were performed with the novel addition of a time-dependant driver.
Results
The final spatial and spectral signatures of the guided wave trains are found to depend strongly on the temporal duration of the initial perturbation. In particular, the wavelength (or frequency) of highest spectral amplitude is found to increase (decrease) within creasing temporal duration, whereas the spectral width decreases. Additionally, the efficiency of generation of fast wave trains is found to decrease strongly with increasing temporal width of the driver, with a cut-off at twice the internal Alfvén crossing time.
Item Type: | Journal Article | |||||||||||||||
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Subjects: | Q Science > QB Astronomy | |||||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||||||||
Library of Congress Subject Headings (LCSH): | Magnetohydrodynamic waves, Sun -- Corona, Solar oscillations | |||||||||||||||
Journal or Publication Title: | Astronomy & Astrophysics | |||||||||||||||
Publisher: | EDP Sciences | |||||||||||||||
ISSN: | 0004-6361 | |||||||||||||||
Official Date: | 5 April 2019 | |||||||||||||||
Dates: |
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Volume: | 624 | |||||||||||||||
Article Number: | L4 | |||||||||||||||
DOI: | 10.1051/0004-6361/201935401 | |||||||||||||||
Status: | Peer Reviewed | |||||||||||||||
Publication Status: | Published | |||||||||||||||
Reuse Statement (publisher, data, author rights): | “Reproduced with permission from Astronomy & Astrophysics, © ESO”. | |||||||||||||||
Access rights to Published version: | Restricted or Subscription Access | |||||||||||||||
Copyright Holders: | © ESO 2019 | |||||||||||||||
Date of first compliant deposit: | 1 April 2019 | |||||||||||||||
Date of first compliant Open Access: | 1 April 2019 | |||||||||||||||
RIOXX Funder/Project Grant: |
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