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Propagating EUV disturbances in the solar corona : two-wavelength observations

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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 ISSN 0004-6361.

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Official URL: http://dx.doi.org/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, Engineering and Medicine > 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:
DateEvent
June 2003Published
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 (Creative Commons)
Funder: Particle Physics and Astronomy Research Council (Great Britain) (PPARC), Great Britain. Dept. of Trade and Industry (DTI)

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