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Title:
Longitudinal intensity oscillations in coronal loops observed with TRACE II. Discussion of Measured Parameters
Authors:
De Moortel, I.; Hood, A. W.; Ireland, J.; Walsh, R. W.
Affiliation:
AA(School of Mathematics and Statistics, University of St Andrews, North Haugh,), AB(School of Mathematics and Statistics, University of St Andrews, North Haugh,), AC(L3Com Analytics Corp., NASA GSFC, Code 682.3, Bldg. 26, Greenbelt, MD 20771, U.S.A.), AD(Department of Physics, Astronomy and Maths, University of Central Lancashire,)
Publication:
Solar Physics, v. 209, Issue 1, p. 89-108 (2002). (SoPh Homepage)
Publication Date:
09/2002
Origin:
KLUWER; SPRINGER
DOI:
10.1023/A:1020960505133
Bibliographic Code:
2002SoPh..209...89D

Abstract

In this paper, we give a detailed discussion of the parameters of longitudinal oscillations in coronal loops, described in Paper I. We found a surprising absence of correlations between the measured variables, with the exception of a relation between the estimated damping length and the period of the intensity variations. Only for 2 out of the 38 cases presented in Paper I did we find a significant perturbation in the 195 Å TRACE data. The loops supporting the propagating disturbances were typically stable, quiescent loops and the total luminosity of the analyzed structures generally varied by no more than 10%. The observed density oscillations are unlikely to be flare-driven and are probably caused by an underlying driver exciting the loop footpoints. It was demonstrated that the rapid damping of the perturbations could not simply be explained as a consequence of the decreasing intensity along the loops. However, we found that (slightly enhanced) thermal conduction alone could account for the observed damping lengths and wavelengths, and, additionally, explain the correlation between propagation period and damping length.
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