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The equatorial rotation rate of the supergranulation cells

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Abstract

The equatorial rotation rate of the supergranulation cells has been observed to be 14.72±0.07°/day. Velocity patterns observed at different times are cross-correlated to derive the rotation rate. The observed rate is 3% faster than recent observations of the surface rotation rate by Doppler shifts. The difference between the cell rate and surface rate is consistent with a model of the supergranular convection in which angular momentum per unit mass is conserved in the radial flow (Foukal, 1977).

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  1. NASA/GSFC, Laboratory for Astronomy and Solar Physics, Southwest Solar Station, 85726, Tucson, Ariz., U.S.A.

    Thomas L. Duvall Jr.

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  1. Thomas L. Duvall Jr.
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Stationed at: 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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Duvall, T.L. The equatorial rotation rate of the supergranulation cells. Sol Phys 66, 213–221 (1980). https://doi.org/10.1007/BF00150578

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  • DOI: https://doi.org/10.1007/BF00150578

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