Thackray, H. and Jain, R. orcid.org/0000-0002-0080-5445 (2017) Fast magnetohydrodynamic waves in a solar coronal arcade. Astronomy & Astrophysics, 608. A108. ISSN 0004-6361
Abstract
Aims. To investigate detailed properties of fast MHD modes of a three-dimensional waveguide for a cylindrical magnetic arcade.
Methods. To derive governing equations and dispersion relations for different density profiles and to numerically solve them to obtain discrete eigenvalues for fast modes and the corresponding eigenfunctions.
Results. We find that small changes in the density structure in the vicinity of the field lines can lead to drastic effects on propagating solutions and, under certain conditions, two evanescent waves arise.
Conclusions. We investigate coronal loop oscillations in an arcade as fast MHD modes of oscillations. We find that coronal loops with slightly different density structures can exhibit different oscillatory behaviour and some eigenmodes can be present or absent depending on this density structure. Though the model has a simple potential field, the role of a cylindrical waveguide in conjunction with differing density structures is demonstrated clearly. Multiple-wavelength observations at several points in the coronal loop arcades is suggested for correct mode identification, that is crucial for unraveling the plasma properties of the oscillating loops.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2017 ESO. This is an author produced version of a paper subsequently published in Astronomy and Astrophysics. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Sun: magnetic fields ; Sun: corona ; Sun: oscillations ; Magnetohydrodynamics; MHD waves |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Science (Sheffield) > School of Mathematics and Statistics (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 25 Sep 2017 14:13 |
Last Modified: | 24 Sep 2024 11:00 |
Status: | Published |
Publisher: | EDP Sciences |
Refereed: | Yes |
Identification Number: | 10.1051/0004-6361/201731193 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:121546 |