Abstract
The low ionization state in parts of a sunspot may play an important
role in its evolution and dynamical state. The cool magnetic interior
region of the umbra develops a substantial neutral atomic and molecular
hydrogen osmotic pressure which can drive a wind outward from the umbra.
Ambipolar diffusion against the magnetically pinned ionized plasma
component can also distort the umbral magnetic field into a filamentary
penumbral structure. This wind can contribute to the development of the
sunspot penumbra and the Evershed flow.
| Original language | English |
|---|---|
| Pages | 230 |
| Publication status | Published - 01 Dec 2006 |