Magnetohydrodynamic Wave Modes of Solar Magnetic Flux Tubes with an Elliptical Cross Section

Anwar A. Aldhafeeri, Gary Verth, Wernher Brevis, David B. Jess, Max McMurdo, Viktor Fedun

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Abstract

The purpose of this paper is to study the behavior of magnetohydrodynamic (MHD) wave modes that propagate in compressible magnetic flux tubes with an elliptical cross-section embedded in a magnetic environment. The dispersion relation which describes the behavior of MHD wave modes permitted in an elliptical magnetic flux tube is solved numerically. Distortion of the spatial structure of the purely real eigenmodes from the well known circular flux tube model has been considered. It has been studied under both photospheric and coronal conditions. It has been shown that (i) solutions in the form of even Mathieu functions are more sensitive to the value of eccentricity than solutions with the form of odd Mathieu functions; (ii) if ellipticity of the magnetic flux tube cross-section is increased, a sausage mode (m = 0) can not be easily identified; (iii) even solutions which correspond to the fluting mode (m = 3) can be misinterpreted as a kink mode (m = 1) due to their similarities. In contrast to the fluting modes which are polarized along the major axis and strongly depend on the ellipticity of the magnetic flux tube, the kink and sausage surface modes are practically unaffected by ellipticity. Several examples of the spatial structure of the eigenmodes permitted in the pores and sunspots has been visualized. The solutions obtained in approximation of cylindrical symmetry are in agreement with previous studies.
Original languageEnglish
Article number50
Number of pages17
JournalThe Astrophysical Journal
Volume912
Issue number1
DOIs
Publication statusPublished - 04 May 2021

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