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

By D. B. (Damian Bryan) King, V. M. (Valery M.) Nakariakov, E. E. Deluca, L. (Leon) Golub and K. G. McClements


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

Topics: QB
Publisher: EDP Sciences
Year: 2003
OAI identifier: oai:wrap.warwick.ac.uk:3804

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