Variations in the Sun’s Meridional Flow over a Solar Cycle

Details Variations in the Sun’s Meridional Flow over a Solar Cycle Variations in the Sun’s Meridional Flow over a Solar Cycle

Mar 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010sci...327.1350h&link_type=abstract

Science, Volume 327, Issue 5971, pp. 1350- (2010).

Physics

47

Scientific paper

The Sun’s meridional flow is an axisymmetric flow that is generally directed from its equator toward its poles at the surface. The structure and strength of the meridional flow determine both the strength of the Sun’s polar magnetic field and the intensity of sunspot cycles. We determine the meridional flow speed of magnetic features on the Sun using data from the Solar and Heliospheric Observatory. The average flow is poleward at all latitudes up to 75°, which suggests that it extends to the poles. It was faster at sunspot cycle minimum than at maximum and substantially faster on the approach to the current minimum than it was at the last solar minimum. This result may help to explain why this solar activity minimum is so peculiar.

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