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The possible role of vortex shedding in the excitation of kink-mode oscillations in the solar corona
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Nakariakov, V. M. (Valery M.), Aschwanden, Markus J. and Van Doorsselaere, Tom (2009) The possible role of vortex shedding in the excitation of kink-mode oscillations in the solar corona. Astronomy & Astrophysics, Vol.502 (No.2). pp. 661-664. doi:10.1051/0004-6361/200810847 ISSN 0004-6361.
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Official URL: http://dx.doi.org/10.1051/0004-6361/200810847
Abstract
We propose a model for the excitation of horizontally polarised transverse (kink) magnetoacoustic oscillations of solar coronal loops by upflows associated with coronal mass ejections. If the magnetic field in the plasma that is dragged in the vertical direction by the flow is parallel to the loop, the phenomenon of vortex shedding causes the appearance of a quasi-periodic horizontal force that
is applied to alternating sides of the loop. The period of the force is determined by the flow speed and the loop’s minor radius. The oscillations are excited the most effectively when the force is in resonance with the natural frequency of the kink oscillations. This model can explain the selectivity of the excitation of the oscillations and the initial growth of the oscillation amplitude.
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): | Sun -- Loop prominences, Vortex shedding, Solar oscillations, Magnetohydrodynamics, Coronal mass ejections, Sun -- Corona -- Magnetic fields | ||||
Journal or Publication Title: | Astronomy & Astrophysics | ||||
Publisher: | EDP Sciences | ||||
ISSN: | 0004-6361 | ||||
Official Date: | August 2009 | ||||
Dates: |
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Volume: | Vol.502 | ||||
Number: | No.2 | ||||
Page Range: | pp. 661-664 | ||||
DOI: | 10.1051/0004-6361/200810847 | ||||
Status: | Peer Reviewed | ||||
Access rights to Published version: | Open Access (Creative Commons) | ||||
Funder: | International Space Science Institute (ISSI), Seventh Framework Programme (European Commission) (FP7) | ||||
Grant number: | 220555 (FP7) |
Data sourced from Thomson Reuters' Web of Knowledge
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