Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...332..767d&link_type=abstract
Astronomy and Astrophysics, v.332, p.767-774 (1998)
Astronomy and Astrophysics
Astrophysics
4
Line: Profiles, Sunspots
Scientific paper
We present two-dimensional spectral observations of two closely located small sunspots in chromospheric lines. Line asymmetries and shifts are derived for the Caii K line in particular. It is found that the majority of Caii K profiles show a blue asymmetry. Red asymmetry may also appear, but only in some tiny regions. Some ephemeral blue asymmetry patches are found in the umbrae, which seem to be related to umbral flashes. On the limb side of the penumbra, the Caii K profiles show a distinguishably blue asymmetry of K1. In contrast, the profiles on the center side are more likely to possess a blue asymmetry of K2, together with a slight red shift of K3. We discuss possible causes for such a peculiar spatial distribution of line asymmetries. Further line profile computations are needed to get a consistent and satisfactory explanation.
Ding Ming-De Ding
Schleicher Helmhold
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