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| Paper: |
Physical Models of Sunspots |
| Volume: |
118, First Advances in Solar Physics Euroconference: Advances in the Physics of Sunspots |
| Page: |
122 |
| Authors: |
Jahn, K. |
| Abstract: |
Physical structure of sunspots have been studied with a use of models based upon various assumptions that simplify the mathematical description of the complex form of large concentrations of the magnetic field in the solar convection zone. This review covers several types of approaches to the problem of constructing a sunspot model. It concentrates on the magnetostatic approximation, since the dynamic models for a whole spot has not been computed yet. Particular attention is paid to the energy transport in the magnetic field of the spot, which is a dynamic process and cannot be described directly within the scope of magnetostatic models. Basic concepts and assumptions are recalled, and their practical applications are discussed together with the main results yielded by particular types of approaches. The magnetostatic models used to probe the mean structure of a spot below the surface as well as the properties observed in the photosphere provide indications which allow to propose a consistent picture of a whole spot. It would have a form of magnetized column that fan out with height and has an interior which is insulated from the external plasma by a mantle formed by interchanging magnetic flux sheets that constitute the penumbra. Properties of both regions are discussed in more detail. A scenario for the formation of the penumbra (very likely, although speculative at present) is also proposed. |
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