UNSPECIFIED. (2005) Transverse waves in a post-flare supra-arcade. ASTRONOMY & ASTROPHYSICS, 430 (3). L65-L68. ISSN 0004-6361

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Abstract

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.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Journal or Publication Title:	ASTRONOMY & ASTROPHYSICS
Publisher:	E D P SCIENCES
ISSN:	0004-6361
Date:	February 2005
Volume:	430
Number:	3
Number of Pages:	4
Page Range:	L65-L68
Identification Number:	10.1051/0004-6361:200400133
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/7419

Data sourced from Thomson Reuters' Web of Knowledge

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