TRACE Observations of Driven Loop Oscillations
I. Ballai, D. B. Jess, M. Douglas

TL;DR
This paper analyzes TRACE satellite observations of coronal loop oscillations induced by a flare, estimating magnetic field strength and inhomogeneity, and discusses how different interpretations affect these estimates.
Contribution
It provides a detailed seismological analysis of observed loop oscillations, comparing multiple interpretations to estimate magnetic field strength and loop properties.
Findings
Coronal loops oscillate with two distinct periods, 501s and 274s.
Magnetic field strength estimates range from 2.0 G to 5.8 G depending on interpretation.
Multiple scenarios exist for interpreting loop oscillations, affecting derived physical parameters.
Abstract
Aims: On 13 June 1998, the TRACE satellite was fortuitously well placed to observe the effects of a flare-induced EIT wave in the corona, and its subsequent interaction with coronal magnetic loops. In this study, we use these TRACE observations to corroborate previous theoretical work, as well as estimate the magnetic field strength and the degree of longitudinal inhomogeneity. Methods: Loop edges are tracked, both spatially and temporally, using wavelet modulus maxima algorithms, with corresponding loop displacements from its quiescent state analysed by fitting scaled sinusoidal functions. The physical parameters of the coronal loop are subsequently determined using seismological techniques. RESULTS: The studied coronal loop is found to oscillate with two distinct periods, 501 +/- 5 s and 274 +/- 7 s, which could be interpreted as belonging to the fundamental and first harmonic, or…
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