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Fast magnetoacoustic wave trains in magnetic funnels of the solar corona
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Pascoe, D. J. (David J.), Nakariakov, V. M. (Valery M.) and Kupriyanova, E. G. (2013) Fast magnetoacoustic wave trains in magnetic funnels of the solar corona. Astronomy & Astrophysics, Volume 560 . Article number A97. doi:10.1051/0004-6361/201322678 ISSN 0004-6361.
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Official URL: http://dx.doi.org/10.1051/0004-6361/201322678
Abstract
Context: Fast magneto-acoustic waves are highly dispersive in waveguides, so they can generate quasi-periodic wave trains if a localised, impulsive driver is applied. Such wave trains have been observed in the solar corona and may be of use as a seismological tool since they depend upon the plasma structuring perpendicular to the direction of propagation.
Aims. We extend existing models of magnetoacoustic waveguides to consider the effects of an expanding magnetic field. The funnel geometry employed includes a field-aligned density structure.
Methods: We performed 2D numerical simulations of impulsively generated fast magneto-acoustic perturbations. The effects of the density contrast ratio, density stratification, and spectral profile of the driver upon the excited wave trains were investigated.
Results: The density structure acts as a dispersive waveguide for fast magneto-acoustic waves and generates a quasi-periodic wave train similar to previous models. The funnel geometry leads to generating additional wave trains that propagate outside the density structure. These newly discovered wave trains are formed by the leakage of transverse perturbations, but they propagate upwards owing to the refraction caused by the magnetic funnel.
Conclusions: The results of our funnel model may be applicable to wave trains observed propagating in the solar corona. They demonstrate similar properties to those found in our simulations.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Library of Congress Subject Headings (LCSH): | Sun -- Corona, Sun -- Corona -- Magnetic fields , Geometrical models , Magnetohydrodynamics, Waves | ||||
Journal or Publication Title: | Astronomy & Astrophysics | ||||
Publisher: | EDP Sciences | ||||
ISSN: | 0004-6361 | ||||
Official Date: | 2013 | ||||
Dates: |
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Volume: | Volume 560 | ||||
Page Range: | Article number A97 | ||||
DOI: | 10.1051/0004-6361/201322678 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access | ||||
Date of first compliant deposit: | 26 December 2015 | ||||
Date of first compliant Open Access: | 26 December 2015 | ||||
Funder: | Marie Curie Cancer Care, European Research Council (ERC), Russia (Federation). Ministerstvo obrazovanii︠a︡ i nauki [Ministry of Education and Science], Kyŏnghŭi Taehakkyo [Kyung Hee University] (Seoul (Korea), Rossiĭskiĭ fond fundamentalʹnykh issledovaniĭ [Russian Foundation for Basic Research] (RFBR) | ||||
Grant number: | 2011-295272 (MC) ; 321141 (ERC) ; 8524 (RF) ; 13-02-00044 (RFFI) |
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