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DOI: 10.1007/s11207-022-02092-4

Problems in Observation and Identification of Torsional Waves in the Lower Solar Atmosphere

A.A. ChelpanovN.I. Kobanov
Dec 2022
摘要
Registering periodic variations of spectral line widths serves as the mainmethod for observing torsional Alfv\'{e}n waves. Theoretically, the methodseems valid, yet it entails a number of caveats when applied to data. Forinstance, the amplitudes of these observations should vary with changes of thelocation on the disk, and they should be associated with no intensityoscillations. We analyze extensive observational material of periodicnon-thermal variations of line widths in coronal holes and facular regions in anumber of spectral lines: H{\alpha}, He I 10830 {\AA}, Ca II 8542 {\AA}, Ba II4554 {\AA}. In most cases, we detected associated intensity oscillations atsimilar frequencies. Besides, we observed no centre-to-limb dependency. Thiscalls for a discussion on the practical validity of the method and on thealternative explanations for the nature of non-thermal variations of spectralline widths. Based on our observations, we consider registering line profilebroadening a necessary but not sufficient means for unambiguous identificationof torsional Alfv\'{e}n waves in the lower solar atmosphere.
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