Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...367.1011h&link_type=abstract
Astronomy and Astrophysics, v.367, p.1011-1021 (2001)
Astronomy and Astrophysics
Astrophysics
24
Sun: Granulation, Sun: Photosphere, Techniques: Image Processing, Techniques: Spectroscopic
Scientific paper
Spectroscopic data with high spatial resolution are used to study the granular dynamics of the Sun. The observations were obtained with the ``Göttingen'' two-dimensional (2D) Fabry-Perot interferometer in the Vacuum Tower Telescope at the Observatorio del Teide/Tenerife. Time sequences of spectral scans across the non-magnetic Fe I 5576 Å line were taken from disc center. The 2D spectroscopic images were reconstructed with speckle methods, from which a spatial resolution of 0\farcs4-0\farcs5 was achieved. A power and coherence analysis of intensity and velocity maps from different photospheric heights has been carried out. The coherence between intensity and velocity fluctuations stays high for structural scales >0\farcs5, which underlines the high spatial resolution of the data. Furthermore, the vertical flow field and its time evolution within exploding granules have been analyzed. We find fast downflows in the dark centers of exploding granules with velocities up to 1.2 km s-1. Additionally, we estimated the flow velocities of so-called ``dark dots''. We discuss indications that these structures represent a new type of downflow within the centers of bright granules.
Hirzberger Johann
Kneer Franz
Koschinsky M.
Ritter Clemens
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