Large-scale motions on the sun - an overview

Details Large-scale motions on the sun - an overview Large-scale motions on the sun - an overview

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987soph..110...23b&link_type=abstract

(Solar Cycle Workshop, 1st, Pasadena, CA, Aug. 17-20, 1986) Solar Physics (ISSN 0038-0938), vol. 110, no. 1, 1987, p. 23-34.

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Laser Doppler Velocimeters, Light Scattering, Red Shift, Solar Atmosphere, Solar Cycles, Velocity Distribution, Computational Astrophysics, Solar Rotation, Spectroscopic Analysis

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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.

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