The Evershed effect in sunspots as a siphon flow along a magnetic flux tube
作者： Benjamín Montesinos , John H. Thomas
DOI: 10.1038/37307
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摘要: The Evershed effect1—a wavelength shift and profile asymmetry in the spectral lines observed from outer regions of sunspots (the penumbra)—has been interpreted as a radial outflow gas sunspot, but dynamics flow have not fully understood2. Although effect seems to stop abruptly at edge penumbra, itself must continue, though tracing its path has proved difficult. Theoretical3,4 observational5,6,7 studies suggested that much continuing may follow magnetic field go below visible surface Sun or just beyond recent observations now confirmed this picture8. Here we show, using theoretical calculations based on more realistic model, acts like siphon3,9,10,11,12 which is driven along flux tube by pressure drop between endpoints tube.
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