EDP Sciences
Free Access
Volume 404, Number 1, June II 2003
Page(s) L1 - L4
Section Letters
DOI https://doi.org/10.1051/0004-6361:20030763
Published online 26 May 2003

A&A 404, L1-L4 (2003)
DOI: 10.1051/0004-6361:20030763


Propagating EUV disturbances in the Solar corona: Two-wavelength observations

D. B. King1, V. M. Nakariakov1, E. E. Deluca2, L. Golub2 and K. G. McClements3

1  Physics Department, University of Warwick, Coventry, CV4 7AL, UK
    e-mail: kingd@astro.warwick.ac.uk; valery@astro.warwick.ac.uk
2  Harvard-Smithsonian Astrophysical Observatory, 60 Garden Street, Cambridge, MA02138, USA
    e-mail: deluca@head-cfa.harvard.edu
3  UKAEA Culham Division, Culham Science Centre, Abingdon, Oxfordshire, OX14 3DB, USA
    e-mail: k.g.mcclements@ukaea.org.uk

(Received 23 January 2003 / 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

Offprint request: D. B. King, kingd@astro.warwick.ac.uk

© ESO 2003

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.