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Discovery of spatial periodicities in a coronal loop using automated edge-tracking algorithms

Jess, D., Mathioudakis, M., Erdelyi, R., Verth, G., McAteer, R.T.J. and Keenan, F.P. (2008) Discovery of spatial periodicities in a coronal loop using automated edge-tracking algorithms. Astrophysical Journal, 680 (2). pp. 1523-1531. ISSN 1538-4357

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A new method for automated coronal loop tracking, in both spatial and temporal domains, is presented. Applying this technique to TRACE data, obtained using the 171 Å filter on 1998 July 14, we detect a coronal loop undergoing a 270 s kink-mode oscillation, as previously found by Aschwanden et al. However, we also detect flare-induced, and previously unnoticed, spatial periodicities on a scale of 3500 km, which occur along the coronal loop edge. Furthermore, we establish a reduction in oscillatory power for these spatial periodicities of 45% over a 222 s interval. We relate the reduction in detected oscillatory power to the physical damping of these loop-top oscillations.

Item Type: Article
Copyright, Publisher and Additional Information: © 2008. The American Astronomical Society. This is an author produced version of a paper published in 'Astrophysical Journal'. Uploaded in accordance with the publisher's self-archiving policy.
Institution: The University of Sheffield
Academic Units: The University of Sheffield > Faculty of Science (Sheffield) > School of Mathematics and Statistics (Sheffield)
Depositing User: Mrs Megan Hobbs
Date Deposited: 12 Mar 2010 18:11
Last Modified: 18 Nov 2015 03:58
Published Version: http://dx.doi.org/10.1086/587735
Status: Published
Publisher: Institute of Physics
Refereed: Yes
Identification Number: 10.1086/587735
Related URLs:
URI: http://eprints.whiterose.ac.uk/id/eprint/10530

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