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Differential Rotation and Global-Scale Velocity Fields

Published online by Cambridge University Press:  07 February 2017

Robert Howard  and
Hirokazu Yoshimura
Robert Howard
Affiliation:
Hale Observatories, Carnegie Institute of Washington, California Institute of Technology, Pasadena, Calif., U.S.A.
Hirokazu Yoshimura
Affiliation:
Hale Observatories, Carnegie Institute of Washington, California Institute of Technology, Pasadena, Calif., U.S.A.

Abstract

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A review is given of the observational and theoretical background of global-scale velocity fields on the solar surface. A newly-developed method of reduction of the Mount Wilson velocity data is described, and the results from this new method are compared with the results of the old method. A preliminary analysis is made of the new results over a short time interval. Small-scale latitude irregularities in the differential rotation are shown to exist. Variations in time which occur in the rotation rate are broadly distributed in latitude and longitude. Although a non-solar (instrumental) cause cannot be found for these variations, such a cause cannot be ruled out at this time. Global-scale non-axisymmetric velocity field patterns intermediate between solar diameter and super-granular scale are shown to exist on the solar surface as predicted by theory.

Type
Part 1: Basic Observed Parameters of the Solar Cycle
Information
Symposium - International Astronomical Union , Volume 71: Basic Mechanisms of Solar Activity , 1976 , pp. 19 - 35
Copyright
Copyright © Reidel 1976 

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