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.
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Bogart, R.S. Large-scale motions on the sun: An overview. Sol Phys 110, 23–34 (1987). https://doi.org/10.1007/BF00148199
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DOI: https://doi.org/10.1007/BF00148199