On the outer boundary of the sunspot penumbra

Details On the outer boundary of the sunspot penumbra On the outer boundary of the sunspot penumbra

2002-02-06

arxiv.org/abs/astro-ph/0202120v1

Solar Phys. 209 (2002) 109-117

Astronomy and Astrophysics

Astrophysics

accepted to Solar Physics

Scientific paper

10.1023/A:1020985530075

Comparison of photographic observations and vector-magnetograph measurements demonstrate, that the outer boundary of the sunspot penumbra --even in complex sunspot groups-- closely follows the 0.075T isogauss line of the total value of the magnetic field, corresponding approximately to the equipartition value in the photosphere. Radio observations also show this feature. The thick penumbra model with interchange convection (Jahn and Schmidt, 1994) gives the best explanation of the penumbral structure.

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