The Evershed motion in sunspots

Chitre, S. M. (1968) The Evershed motion in sunspots Solar Physics, 4 (2). pp. 168-175. ISSN 0038-0938

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The Evershed motion is postulated as a steady, laminar flow of material along a limiting field line which separates the umbral magnetic field from the penumbral. Assuming that the Evershed flow starts from the spot-base with a velocity which is adequate to carry the convective flux at that level, the velocity at the surface comes out to be of the order of 1 km/sec, in good agreement with the observed Evershed velocity.

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