Seismology of transversely oscillating coronal loops with siphon flows

Terradas, Jaume, Arregui, Inigo, Verth, Gary and Goossens, Marcel (2011) Seismology of transversely oscillating coronal loops with siphon flows. The Astrophysical Journal, 729 (2). L22-L25. ISSN 0004-637X

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There are ubiquitous flows observed in the solar atmosphere of sub-Alfvénic speeds; however, after flaring and coronal mass ejection events flows can become Alfvénic. In this Letter, we derive an expression for the standing kink mode frequency due to siphon flow in coronal loops, valid for both low and high speed regimes. It is found that siphon flow introduces a linear, spatially dependent phase shift along coronal loops and asymmetric eigenfunctions. We demonstrate how this theory can be used to determine the kink and flow speed of oscillating coronal loops with reference to an observational case study. It is shown that the presence of siphon flow can cause the underestimation of magnetic field strength in coronal loops using the traditional seismological methods.

Item Type: Article
Uncontrolled Keywords: magnetic fields, magnetohydrodynamics, sun: corona
Subjects: F300 Physics
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: EPrint Services
Date Deposited: 26 Apr 2011 11:32
Last Modified: 31 Jul 2021 08:39

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