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On spatial characteristics of five-minute oscillations in the sunspot umbra

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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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Authors and Affiliations

  1. Siberian Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation (SibIZMIR), P.O. Box 4, 664033, Irkutsk, U.S.S.R.

    N. I. Kobanov

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  1. N. I. Kobanov
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Kobanov, N.I. On spatial characteristics of five-minute oscillations in the sunspot umbra. Sol Phys 125, 25–30 (1990). https://doi.org/10.1007/BF00154775

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  • DOI: https://doi.org/10.1007/BF00154775

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