Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...277..235d&link_type=abstract
Astronomy and Astrophysics, Vol. 277, p. 235 (1993)
Astronomy and Astrophysics
Astrophysics
16
Sun: Sunspots - Sun: Atmosphere - Radiative Transfer
Scientific paper
The common interpretation of observed shifts and asymmetries of spectral lines emerging from sunspot penumbrae (Evershed effect) is a homogeneous material flow such that the flow velocity increases with depth. This interpretation is found to be unconvincing in view of theoretical arguments which predict a decreasing flow speed. As an alternative it is suggested that the fraction of the penumbral volume which contains the streaming gas increases with depth. The spectroscopic signature of such a penumbral structure is investigated by calculating synthetic line profiles. Provided that the postulated spatial inhomogeneity cannot be resolved with present day telescopes, it is shown that the calculated line shifts and asymmetries are consistent with observations even if the absolute value of the velocity decreases with depth.
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