Large-scale motions on the sun: An overview |
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| Authors: | Richard S Bogart |
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| Institution: | (1) Center for Space Science and Astrophysics, Stanford University, 94305 Stanford, CA, U.S.A. |
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| Abstract: | The history and present status of observations of large-scale velocity fields in the solar atmosphere are reviewed. Observations of the torsional oscillation and of mean meridional circulation suggest a connection of large-scale dynamics with the solar cycle. Significant problems must be solved before Doppler observations can match the precision of tracer measurements, particularly allowing for the effects of changes in line-profile asymmetries and for scattered light. Coordinated observations would establish the reliability of Doppler techniques, but Doppler measurements with precision of order 1 m s–1 made in a proper spatial-temporal window appear necessary for the identification of sub-global velocity fields varying with time-scales less than that of the solar cycle. This survey is presented in the context of the Solar Cycle Workshop held at Big Bear Lake, Calif, August 17–20, 1986.Solar Cycle Workshop Paper. |
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