Moreels, M.G., Freij, N., Erdelyi, R. et al. (2 more authors) (2015) Observations and mode identification of sausage waves in a magnetic pore. Astronomy and Astrophysics, 579. A73. ISSN 0004-6361
Abstract
Aims. We aim to determine the phase speed of an oscillation in a magnetic pore using only intensity images at one height. The observations were obtained using the CRisp Imaging SpectroPolarimeter at the Swedisch 1-m Solar Telescope and show variations in both cross-sectional area and intensity in a magnetic pore.
Methods. We have designed and tested an observational method to extract the wave parameters that are important for seismology. We modelled the magnetic pore as a straight cylinder with a uniform plasma both inside and outside the flux tube and identify different wave modes. Using analytic expressions, we are able to distinguish between fast and slow modes and obtain the phase speed of the oscillations.
Results. We found that the observed oscillations are slow modes with a phase speed around 5 km s-1. We also have strong evidence that the oscillations are standing harmonics.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © ESO, 2015. Reproduced in accordance with the publisher's self-archiving policy. |
Keywords: | magnetohydrodynamics (MHD); Sun: photosphere; Sun: oscillations; Sun: helioseismology; methods: analytical |
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: | 28 Jan 2016 13:29 |
Last Modified: | 28 Jan 2016 13:29 |
Published Version: | https://dx.doi.org/10.1051/0004-6361/201425096 |
Status: | Published |
Publisher: | EDP Sciences |
Refereed: | Yes |
Identification Number: | 10.1051/0004-6361/201425096 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:91951 |