A&A 430, L65-L68 (2005)
Transverse waves in a post-flare supra-arcadeE. Verwichte, V. M. Nakariakov and F. C. Cooper
Department of Physics, University of Warwick, Coventry CV4 7AL, UK
(Received 30 September 2004 / Accepted 10 December 2004 )
Observations of propagating transverse waves in an open magnetic field structure with the Transition Region And Coronal Explorer (TRACE) are presented. Waves associated with dark tadpole-like sunward moving structures in the post-flare supra-arcade of NOAA active region 9906 on the 21 of April 2002 are analysed. They are seen as quasi-periodic transverse displacements of the dark tadpole tails, with periods in the range of 90-220 s. Their phase speeds and displacement amplitudes decrease as they propagate sunwards. At heights of 90 and 60 Mm above the post-flare loop footpoints the phase speeds are in the ranges 200-700 km s -1 and 90-200 km s -1 respectively. Furthermore, for consecutive tadpoles the phase speeds decrease and periods increase as a function of time. The waves are interpreted as propagating fast magnetoacoustic kink waves guided by a vertical, evolving, open structure.
Key words: Sun: oscillations -- magnetohydrodynamics (MHD)
© ESO 2005