On spatial characteristics of five-minute oscillations in the sunspot umbra |
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| Authors: | N I Kobanov |
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| Institution: | (1) Siberian Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation (SibIZMIR), P.O. Box 4, 664033 Irkutsk, U.S.S.R. |
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| Abstract: | Using a differential method we have carried out observations of oscillations in six sunspots. Spectral lines Fe i 5434 Å and Fe i 5576 Å were used. Horizontal waves are not observed in the sunspot umbra photosphere. Results obtained indicate that, at least, the sunspot umbra oscillates as a single whole. |
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