The spatial structure of the Evershed effect.

Details The spatial structure of the Evershed effect. The spatial structure of the Evershed effect.

May 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...309l...4w&link_type=abstract

Astronomy and Astrophysics, v.309, p.L4-L6

Astronomy and Astrophysics

Astrophysics

11

Sunspots, Penumbrae, Evershed Effect, Line Asymmetries, Fine Structures

Scientific paper

The line asymmetry from the Evershed effect disappears beyond the boundary of the white-light penumbra over a horizontal distance of less than 500km. Immediately beyond the ends of the dark penumbral continuum structures, the lines NiI5435.9 (g=0.5) and FeI5434.5 (g=O; formed about 300km higher) simultaneously lose their asymmetry. The spatial distance of maximally 500km is too short for a "disappearence with height" as suggested by models of a penumbral "canopy". Instead, the data favour a rather flat orientation of the dark structures with an abrupt disappearance. It is suggested that this location marks the sharp threshold of the equipartition between kinetic and magnetic energy density at the outer penumbral border.

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