Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...323..599d&link_type=abstract
Astronomy and Astrophysics, v.323, p.599-605
Astronomy and Astrophysics
Astrophysics
12
Sun: Activity, Granulation, Sunspots, Methods Observational, Techniques: Interferometric
Scientific paper
This paper deals with a detailed morphological and photometric investigation of solar small-scale features in the vicinity of an irregular sunspot group. The observations were performed with the Vacuum Tower Telescope at the Observatorio del Teide/Tenerife on May 18, 1994. The speckle masking method has been applied to reconstruct almost diffraction limited filtergrams in two different wavelength regions. For this purpose, we used the two-dimensional spectrometer of the Universitaets-Sternwarte Goettingen which was slightly modified for the speckle observations. In the narrow-band filtergrams, we studied the intensity enhancement in the inner wings of the strong chromospheric absorption line NaD_2_ (moustache phenomenon). The corresponding filtergrams in the white-light channel show a clear correlation of photospheric filigree and the moustache phenomenon. The bandwidth of the small-passband channel amounts to 0.014nm. This is the highest spectral resolution reached with speckle masking imaging so far.
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