Volume 404, Number 1, June II 2003
|Page(s)||L1 - L4|
|Published online||26 May 2003|
Letter to the Editor
Propagating EUV disturbances in the Solar corona: Two-wavelength observations
Physics Department, University of Warwick, Coventry, CV4 7AL, UK e-mail: firstname.lastname@example.org; email@example.com
2 Harvard-Smithsonian Astrophysical Observatory, 60 Garden Street, Cambridge, MA02138, USA e-mail: firstname.lastname@example.org
3 UKAEA Culham Division, Culham Science Centre, Abingdon, Oxfordshire, OX14 3DB, USA e-mail: email@example.com
Corresponding author: D. B. King, firstname.lastname@example.org
Accepted: 19 March 2003
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.
Key words: magnetohydrodynamics (MHD) / waves / Sun: activity / Sun: corona / Sun: oscillations / Sun: UV radiation
© ESO, 2003
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