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Spatial seismology of a large coronal loop arcade from TRACE & EIT observations of its transverse oscillations View all abstracts by submitter

Erwin Verwichte   Submitted: 2010-05-10 12:54

We present a study of transverse loop oscillations in a large coronal loop arcade, using observations from the Transition Region And Coronal Explorer (TRACE) and Extreme-ultraviolet Imaging Telescope (EIT). For the first time we reveal the presence of long-period transverse oscillations with periods between 24 minutes and 3 hours. One loop bundle, 690 Mm long and with an oscillation period of 40 min., is analysed in detail and its oscillation characteristics are determined in an automated manner. The oscillation quality factor is similar to what has been found earlier for oscillations in much shorter loops. This indicates that the damping mechanism of transverse loop oscillations is independent of loop length or period. The displacement profile along the whole length of the oscillating loop is determined for the first time and consistently between TRACE and EIT. By comparing the observed profile with models of the three-dimensional geometry of the equilibrium and perturbed loop, we test the effect of longitudinal structuring (spatial seismology) and find that the observations cannot unambigiously distinguish between structuring and non-planarity of the equilibrium loop. Associated intensity variations with a similar periodicity are explained in terms of variations in the line of sight column depth. Also, we report intensity oscillations at the loop foot point, which are in anti-phase with respect to the intensity oscillations in the loop body. Lastly, this observation offers the first opportunity to use the transverse oscillations of the arcade to model the Alfvén speed profile in the global corona.

Authors: E. Verwichte, C. Foullon & T. Van Doorsselaere
Projects: SoHO-EIT,TRACE

Publication Status: ApJ, in press
Last Modified: 2010-05-11 07:11
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