Transverse waves in a post-flare supra-arcade

Details Transverse waves in a post-flare supra-arcade Transverse waves in a post-flare supra-arcade

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...430l..65v&link_type=abstract

Astronomy and Astrophysics, v.430, p.L65-L68 (2005)

Astronomy and Astrophysics

Astrophysics

36

Sun: Oscillations, Magnetohydrodynamics (Mhd)

Scientific paper

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 21st 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.

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