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Paper: The Sharp Boundary of Magnetic Field and Flow in Sunspot Penumbrae
Volume: 118, First Advances in Solar Physics Euroconference: Advances in the Physics of Sunspots
Page: 175
Authors: Wiehr, E.
Abstract: The line asymmetry, characteristic signature of the Evershed effect, ends abruptly at the outer sunspot border defined by the ends of the dark penumbral structures. This is most impressively demonstrated by the absence of line asymmetries at the center-side of sunspots close enough to the limb that the Wilson effect makes that penumbra invisible. It supports the idea that the line asymmetries are produced by a superposition of Doppler-shifted profiles from the dark, and less shifted profiles from the bright penumbral structures.
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