Observational Evidence for Rising Penumbral Flux Tubes? |
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| Authors: | J Jur?ák M Sobotka |
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| Institution: | (1) Astronomical Institute, Academy of Sciences of the Czech Republic, 25165 Ondrejov, Czech Republic |
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| Abstract: | On 13 May 2000 parts of a penumbra were observed in an active region NOAA 8990 with the La Palma Stokes Polarimeter attached
to the Swedish Vacuum Solar Telescope. The stratification over the solar atmosphere of different physical parameters is retrieved
from these data by using the Stokes inversion based on response functions. The results confirm the previous findings of the
penumbral structure. In general, the magnetic field becomes weaker and more horizontal with increasing distance from the umbra
and the line-of-sight velocities are increasing towards the outer boundary of the penumbra. The results also suggest the existence
of the unresolved fine structure of the penumbra. The stratifications of the temperature and of the magnetic field strength
indicate the presence of rising flux tubes, which were predicted theoretically by Schlichenmaier, Jahn and Schmidt (1998,
Astron. Astrophys.
337, 897). |
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| Keywords: | Sun: sunspots Sun: magnetic field |
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