A siphon-flow model of the photospheric Evershed flow in a sunspot

Details A siphon-flow model of the photospheric Evershed flow in a sunspot A siphon-flow model of the photospheric Evershed flow in a sunspot

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...407..398t&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 407, no. 1, p. 398-401.

Physics

46

Penumbras, Photosphere, Solar Magnetic Field, Solar Physics, Sunspots, Solar Atmosphere, Stellar Models

Scientific paper

The Evershed flow at photospheric heights in a sunspot penumbra is modeled theoretically as a siphon flow along individual, arched magnetic flux tubes embedded in an atmosphere permeated by a uniform magnetic field. This approach is suggested by the recent evidence that the penumbra is a deep structure with a significant amount of emerging flux, rather than a shallow structure overlying field-free gas. The model resolves two problems associated with siphon-flow models based on a shallow penumbra: it produces arched flux tubes of sufficient horizontal extent, and it explains how the optically thin flux tubes carrying the Evershed flow can appear dark.

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