Seismology of transversely oscillating coronal loops with siphon flows

Jaume Terradas, Inigo Arregui, Gary Verth, Marcel Goossens

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

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.
Original languageEnglish
Pages (from-to)L22-L25
JournalThe Astrophysical Journal
Volume729
Issue number2
DOIs
Publication statusPublished - 26 Apr 2011

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