Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...296..567d&link_type=abstract
Astronomy and Astrophysics, v.296, p.567
Astronomy and Astrophysics
Astrophysics
29
Sun: Sunspots, Sun: Chromosphere, Techniques: Image Processing
Scientific paper
We present high spatial resolution observations of a sunspot near the solar disc centre obtained with the Vacuum Tower Telescope at the Observatorio del Teide (Tenerife). Our investigation aims at a better comprehension of umbral and penumbral fine structures. The speckle masking image reconstruction technique was applied to narrow-band filtergrams taken in the red wing of Hα. The reconstructed images reveal small-scale structures close to the telescopic diffraction limit of 0.19". Especially, the moustache phenomenon - the intensity enhancement in the inner wings of strong chromospheric absorbtion lines - is clearly discernible. The moustaches are concentrated at the outer border of the penumbra and in its neighbourhood. There, they appear at locations coinciding with the intergranular lanes. The moustaches are not circular in shape. Instead they show sharp intensity peaks surrounded by bright areas with frayed borders. Due to the high spatial resolution achieved in the restored filtergrams and the correction for the speckle transfer function, we find much higher intensities than in previous investigations concerning the moustache phenomenon. The peak intensities are sometimes larger than 1.7 times the intensity of the granular background, i.e. the line profiles in the inner wing of Hα exhibit emission features. Attempts to restore narrow-band filtergrams with speckle interferometry are relatively new. In this paper it is shown that the speckle masking technique is capable to reconstruct images with a low signal-to-noise ratio taken within a passband of 0.05nm.
de Boer C. R.
Denker Carsten
Kneer Franz
Volkmer Reiner
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