Penumbral Finestructure: Need for Larger Telescopes

Bibcode
2001AGM....18S1003B
Balthasar, H.; Sütterlin, P.; Collados, M.
Bibliographical reference

Astronomische Gesellschaft Abstract Series, Vol. 18., Abstracts of Contributed Talks and Posters presented at the Annual Scientific Meeting of the Astronomische Gesellschaft at the Joint European and National Meeting JENAM 2001 of the European Astronomical Society and the Astronomische Gesellschaft at Munich, September 10-15, 2001, abstract #MS 10 03.

Advertised on:
0
2001
Number of authors
3
IAC number of authors
1
Citations
0
Refereed citations
0
Description
We obtained at the same time G-band images at the Dutch Open Telescope (DOT) on La Palma and spectropolarimetric data in the near infrared at the German Vacuum Tower Telescope (VTT) on Tenerife. The spectropolarimetric data show interesting correlations. Bright filaments have a smaller magnetic field strength, and higher Evershed velocities occur in dark structures. This result is in agreement with some previous observations, but also in contradiction to others. However, we suffer from the fact that the resolution limit of the VTT at a wavelength of 1.565 μm corresponding to 400 km. Spatial power spectra derived from the DOT data indicate a typical width of 250 km for the penumbral filaments. Obviously a solar telescope with an aperture of at least 1.5 m is needed to obtain sophisticated results for penumbral structures.
Type
Non-refereed

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