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Solar Physics

, Volume 267, Issue 2, pp 267–277 | Cite as

Solar Polar Fields During Cycles 21 – 23: Correlation with Meridional Flows

  • P. JanardhanEmail author
  • Susanta K. Bisoi
  • S. Gosain
Article

Abstract

We have examined polar magnetic fields for the last three solar cycles, viz. Cycles 21, 22, and 23 using NSO/Kitt Peak synoptic magnetograms. In addition, we have used SOHO/MDI magnetograms to derive the polar fields during Cycle 23. Both Kitt Peak and MDI data at high latitudes (78° – 90°) in both solar hemispheres show a significant drop in the absolute value of polar fields from the late declining phase of the Solar Cycle 22 to the maximum of the Solar Cycle 23. We find that long-term changes in the absolute value of the polar field, in Cycle 23, are well correlated with changes in meridional-flow speeds that have been reported recently. We discuss the implication of this in influencing the extremely prolonged minimum experienced at the start of the current Cycle 24 and in forecasting the behavior of future solar cycles.

Keywords

Polar magnetic fields Meridional flows Solar cycle MDI magnetograms 

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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  1. 1.Physical Research LaboratoryAstronomy & Astrophysics DivisionAhmedabadIndia
  2. 2.Udaipur Solar ObservatoryUdaipurIndia

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