Journal
ASTRONOMY & ASTROPHYSICS
Volume 404, Issue 1, Pages L1-L4Publisher
E D P SCIENCES
DOI: 10.1051/0004-6361:20030763
Keywords
magnetohydrodynamics (MHD); waves; Sun : activity; Sun : corona; Sun : oscillations; Sun : UV radiation
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Quasi-periodic EUV disturbances simultaneously observed in 171 Angstrom and 195 Angstrom 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.
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