On the outer boundary of the sunspot penumbra |
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| Authors: | Béla Kálmán |
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| Institution: | (1) Heliophysical Observatory of the Hungarian Academy of Sciences, P.O.Box 30., H-4010 Debrecen, Hungary |
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| Abstract: | 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 0.075 T iso-gauss 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.
Supplementary material to this paper is available in electronic form at http://dx.doi.org/10.1023/A:1020985530075 |
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