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Solar rotation, 1966–1978

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Abstract

Photospheric and chromospheric spectroscopic Doppler rotation rates for the full solar disk are analyzed for the period July, 1966 to July, 1978. An approximately linear secular increase of the equatorial rate of 3.7% for these 12 years is found (in confirmation of Howard, 1976). The high latitude rates above 65 ° appear to vary with a peak-to-peak amplitude of 8%, or more, phased to the sunspot cycle such that the most rapid rotation occurs at, or following, solar maximum. The chromosphere, as indicated by Hα, has continued to rotate on the average 3% faster than the photosphere agreeing with past observations. Sources of error are discussed and evaluated.

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Authors and Affiliations

  1. Kitt Peak National Observatory, 85726, Tucson, Ariz., U.S.A.

    W. Livingston & T. L. Duvall Jr.

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  1. W. Livingston
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  2. T. L. Duvall Jr.
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Operated by the Association of Universities for Research in Astronomy, Inc., under contract with the National Science Foundation.

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Livingston, W., Duvall, T.L. Solar rotation, 1966–1978. Sol Phys 61, 219–231 (1979). https://doi.org/10.1007/BF00150407

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  • DOI: https://doi.org/10.1007/BF00150407

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