Discovery of Spatial Periodicities in a Coronal Loop Using Automated Edge-Tracking Algorithms

Jess, David, Mathioudakis, Mihalis, Erdélyi, Robert, Verth, Gary, McAteer, James and Keenan, Francis (2008) Discovery of Spatial Periodicities in a Coronal Loop Using Automated Edge-Tracking Algorithms. The Astrophysical Journal, 680 (2). pp. 1523-1531. ISSN 0004-637X

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Abstract

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.

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