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Title:
The detection of 3 & 5 min period oscillations in coronal loops
Authors:
De Moortel, I.; Ireland, J.; Hood, A. W.; Walsh, R. W.
Affiliation:
AA(School of Mathematics and Statistics, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS, Scotland), AB(L3Com Analytics Corp., NASA GSFC, Code 682.3, Bldg. 26, Greenbelt, MD 20771, USA), AC(School of Mathematics and Statistics, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS, Scotland), AD(Department of Physics, Astronomy and Maths, University of Central Lancashire, Preston, PR1 2HE, UK)
Publication:
Astronomy and Astrophysics, v.387, p.L13-L16 (2002) (A&A Homepage)
Publication Date:
05/2002
Origin:
A&A
Astronomy Keywords:
MHD, Sun: oscillations, corona, sunspots
DOI:
10.1051/0004-6361:20020436
Bibliographic Code:
2002A&A...387L..13D

Abstract

High cadence, 171 Alfvén A, TRACE observations show that outward propagating intensity disturbances are a common feature in large, quiescent coronal loops. These oscillations are interpreted as propagating slow magneto-acoustic waves. Using a wavelet analysis, we found periods of the order of 282 +/- 93 s. However, a careful study of the location of the footpoints revealed a distinct separation between those loops that support oscillations with periods smaller than 200 s and periods larger than 200 s. It was found that loops that are situated above sunspot regions display intensity oscillations with a period of the order of 172 +/- 32 s, whereas oscillations in ``non-sunspot'' loops show periods of the order of 321 +/- 74 s. We conclude that the observed longitudinal oscillations are not flare-driven but are most likely caused by an underlying driver exciting the loop footpoints. This result suggests that the underlying oscillations can propagate through the transition region and into the corona.
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