Verwichte, E. (Erwin), Aschwanden, Markus J., Van Doorsselaere, Tom, Foullon, C. (Claire) and Nakariakov, V. M. (Valery M.). (2009) Seismology of a large solar coronal loop from EUVI/STEREO observations of its transverse oscillation. Astrophysical Journal, Vol.698 (No.1). pp. 397-404. ISSN 0004-637X

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Abstract

The first analysis of a transverse loop oscillation observed by both Solar TErrestrial RElations Observatories (STEREO) spacecraft is presented, for an event on the 2007 June 27 as seen by the Extreme Ultraviolet Imager (EUVI). The three-dimensional loop geometry is determined using a three-dimensional reconstruction with a semicircular loop model, which allows for an accurate measurement of the loop length. The plane of wave polarization is found from comparison with a simulated loop model and shows that the oscillation is a fundamental horizontally polarized fast magnetoacoustic kink mode. The oscillation is characterized using an automated method and the results from both spacecraft are found to match closely. The oscillation period is 630 +/- 30 s and the damping time is 1000 +/- 300 s. Also, clear intensity variations associated with the transverse loop oscillations are reported for the first time. They are shown to be caused by the effect of line-of-sight integration. The Alfven speed and coronal magnetic field derived using coronal seismology are discussed. This study shows that EUVI/STEREO observations achieve an adequate accuracy for studying long-period, large-amplitude transverse loop oscillations.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Solar magnetic fields, Magnetohydrodynamics, Sun -- Corona, Solar oscillations
Journal or Publication Title:	Astrophysical Journal
Publisher:	IOP Publishing
ISSN:	0004-637X
Date:	10 June 2009
Volume:	Vol.698
Number:	No.1
Number of Pages:	8
Page Range:	pp. 397-404
Identification Number:	10.1088/0004-637X/698/1/397
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	Engineering and Physical Sciences Research Council (EPSRC), United States. National Aeronautics and Space Administration (NASA), Marie Curie Fellowship Association, Science and Technology Facilities Research Council (Great Britain) (STFC), Seventh Framework Programme (European Commission) (FP7)
Grant number:	N00173-02-C-2035 (NASA)
URI:	http://wrap.warwick.ac.uk/id/eprint/27919

Data sourced from Thomson Reuters' Web of Knowledge

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