H. Balthasar, H. Schleicher
Abstract
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Aims. Running penumbral waves are often reported from observations in chromospheric lines or lines formed in the upper photosphere. In this work we investigate whether they can be detected in a line formed in the mid to lower photosphere.
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Aims. Running penumbral waves are often reported from observations in chromospheric lines or lines formed in the upper photosphere. In this work we investigate whether they can be detected in a line formed in the mid to lower photosphere.
Key concepts: Physics, Photosphere, Sunspot, Astrophysics, Chromosphere, Line (geometry), Spectroscopy, Astronomy