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Solar Physics

, Volume 27, Issue 1, pp 80–88 | Cite as

Observations of sunspot umbral velocity oscillations

  • Arvind Bhatnagar
  • W. C. Livingston
  • J. W. Harvey
Article
Received:

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.

Keywords

Spectrum Analysis Power Spectrum Velocity Component Oscillatory Velocity Power Spectrum Analysis 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© D. Reidel Publishing Company 1972

Authors and Affiliations

  • Arvind Bhatnagar
    • 1
  • W. C. Livingston
    • 2
  • J. W. Harvey
    • 2
  1. 1.Big Bear Solar Observatory, Hale Observatories, Carnegie Institution of Washington, California Institute of TechnologyU.S.A.
  2. 2.Kitt Peak National ObservatoryTucsonU.S.A.

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