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Observations of sunspot umbral velocity oscillations

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Abstract

Sunspot umbral molecular lines have been used to look for the oscillatory velocities in the umbra. Power spectrum analysis showed conspicuous power for periods in the range between 448 and 310 s. The maximum peak-to-peak amplitude of the umbral oscillatory velocity component is observed to be in the order of 0.5 km s−1.

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Authors and Affiliations

  1. Big Bear Solar Observatory, Hale Observatories, Carnegie Institution of Washington, California Institute of Technology, U.S.A.

    Arvind Bhatnagar

  2. Kitt Peak National Observatory, Tucson, Ariz., U.S.A.

    W. C. Livingston & J. W. Harvey

Authors
  1. Arvind Bhatnagar
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  2. W. C. Livingston
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  3. J. W. Harvey
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Visiting Astronomer, Solar Division, Kitt Peak National Observatory

Operated by the Association of Universities for Research in Astronomy, Inc., under contract with the National Science Foundation.

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Bhatnagar, A., Livingston, W.C. & Harvey, J.W. Observations of sunspot umbral velocity oscillations. Sol Phys 27, 80–88 (1972). https://doi.org/10.1007/BF00151772

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  • DOI: https://doi.org/10.1007/BF00151772

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