Structure of sunspot penumbrae - Fallen magnetic flux tubes

Details Structure of sunspot penumbrae - Fallen magnetic flux tubes Structure of sunspot penumbrae - Fallen magnetic flux tubes

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...388..211w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 388, March 20, 1992, p. 211-217.

Astronomy and Astrophysics

Astrophysics

18

Magnetic Flux, Penumbras, Photosphere, Solar Magnetic Field, Sunspots, Magnetohydrodynamic Flow, Spatial Resolution

Scientific paper

A model is presented of a sunspot penumbra involving magnetic flux tubes that have fallen into the photosphere and float there. An upwelling at the inner end of a fallen tube continuously provides additional gas. This gas flows along and lengthens the tube and is observable as the Evershed flow. Fallen flux tubes may appear as bright streaks near the upwelling, but they become dark filaments further out. The model is corroborated by recent optical high-resolution magnetic data regarding the penumbral filaments, by the 12-micron magnetic measurements relevant to the height of the temperature minimum, and by photographs of the umbra/penumbra boundary.

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