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Excitation of vertical coronal loop oscillations by impulsively driven flows
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Kohutova, Petra and Verwichte, E. (Erwin) (2018) Excitation of vertical coronal loop oscillations by impulsively driven flows. Astronomy & Astrophysics, 613 . L3. doi:10.1051/0004-6361/201832656 ISSN 1432-0746.
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Official URL: https://doi.org/10.1051/0004-6361/201832656
Abstract
Context
Flows of plasma along a coronal loop caused by the pressure difference between loop footpoints are common in the solar corona.
Aims
We aim to investigate the possibility of excitation of loop oscillations by an impulsively driven flow triggered by an enhanced pressure in one of the loop footpoints.
Methods
We carry out 2.5D magnetohydrodynamic (MHD) simulations of a coronal loop with an impulsively driven flow and investigate the properties and evolution of the resulting oscillatory motion of the loop.
Results
The action of the centrifugal force associated with plasma moving at high speeds along the curved axis of the loop is found to excite the fundamental harmonic of a vertically polarised kink mode. We analyse the dependence of the resulting oscillations on the speed and kinetic energy of the flow.
Conclusions
We find that flows with realistic speeds of less than 100 km sā1 are sufficient to excite oscillations with observable amplitudes. We therefore propose plasma flows as a possible excitation mechanism for observed transverse loop oscillations.
Item Type: | Journal Article | |||||||||
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Subjects: | Q Science > QB Astronomy | |||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||
SWORD Depositor: | Library Publications Router | |||||||||
Library of Congress Subject Headings (LCSH): | Magnetohydrodynamics, Sun -- Corona, Solar oscillations, Solar magnetic fields | |||||||||
Journal or Publication Title: | Astronomy & Astrophysics | |||||||||
Publisher: | EDP Sciences | |||||||||
ISSN: | 1432-0746 | |||||||||
Official Date: | 23 May 2018 | |||||||||
Dates: |
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Volume: | 613 | |||||||||
Article Number: | L3 | |||||||||
DOI: | 10.1051/0004-6361/201832656 | |||||||||
Status: | Peer Reviewed | |||||||||
Publication Status: | Published | |||||||||
Access rights to Published version: | Restricted or Subscription Access | |||||||||
Date of first compliant deposit: | 12 June 2018 | |||||||||
Date of first compliant Open Access: | 12 June 2018 | |||||||||
RIOXX Funder/Project Grant: |
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