Computer Science
Scientific paper
Nov 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996nawg.1996..193w&link_type=abstract
Nachr. Akad. Wiss. Göttingen II, Jahrg. 1996, Nr. 4, p. 193 - 196
Computer Science
Sunspots: Velocity Fields, Sunspots: Line Profiles
Scientific paper
At sufficiently large heliocentric angles θ ≥ 65° where the line-of-sight is almost parallel to the penumbral filaments, the line asymmetry of the Evershed effect shows up as a distinct "kink" in the line wings. It can be explained by a superposition of a main component from the bright penumbral structures containing a very small gasflow and a line satellite from the dark structures containing a gasflow of 5.2 km s-1 at 250 km and 7.7 km s-1 at 550 km height. This flow is just strong enough to yield a Doppler shift of the line satellite slightly larger than the line halfwidths. Any inclination of the line-of-sight with respect to the structures reduces the distance of the satellite. The kink is therefore absent in limb-side penumbrae and in spots at smaller viewing angles. In such cases, the superposition produces a "smooth" asymmetry without a kink, but with an additional line core shift of maximally 0.8 km s-1.
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