King, D. B. (Damian Bryan), Nakariakov, V. M. (Valery M.), Deluca, E. E., Golub, L. (Leon) and McClements, K. G. (2003) Propagating EUV disturbances in the solar corona : two-wavelength observations. Astronomy & Astrophysics, Vol.404 (No.1). L1-L4. doi:10.1051/0004-6361:20030763

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Abstract

Quasi-periodic EUV disturbances simultaneously observed in 171 Å and 195 Å TRACE bandpasses propagating outwardly in a fan-like magnetic structure of a coronal active region are analysed. Time series of disturbances observed in the different bandpasses have a relatively high correlation coefficient (up to about 0.7). The correlation has a tendency to decrease with distance along the structure: this is consistent with an interpretation of the disturbances in terms of parallel-propagating slow magnetoacoustic waves. The wavelet analysis does not show a significant difference between waves observed in different bandpasses. Periodic patterns of two distinct periods: 2-3 min and 5-8 min are detected in both bandpasses, existing simultaneously and at the same distance along the loop, suggesting the nonlinear generation of the second harmonics.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Sun -- Corona, Magnetohydrodynamic waves, Solar oscillations, Sun -- Loop prominences
Journal or Publication Title:	Astronomy & Astrophysics
Publisher:	EDP Sciences
ISSN:	0004-6361
Official Date:	June 2003
Dates:	Date Event June 2003 Published
Volume:	Vol.404
Number:	No.1
Page Range:	L1-L4
DOI:	10.1051/0004-6361:20030763
Status:	Peer Reviewed
Access rights to Published version:	Open Access
Funder:	Particle Physics and Astronomy Research Council (Great Britain) (PPARC), Great Britain. Dept. of Trade and Industry (DTI)

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