Bibcode
Balthasar, H.; Sütterlin, P.; Collados, M.
Referencia bibliográfica
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.
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2001
Número de citas
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Número de citas referidas
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Descripción
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.