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Peculiar behavior of solar polar fields during solar cycles 21-23: Correlation with meridional flow speed

Published online by Cambridge University Press:  18 July 2013

Susanta Kumar Bisoi  and
P. Janardhan
Susanta Kumar Bisoi
Affiliation:
Physical Research Laboratory, Astronomy & Astrophysics Division, Ahmedabad 380 009, India email: susanta@prl.res.in
P. Janardhan
Affiliation:
Physical Research Laboratory, Astronomy & Astrophysics Division, Ahmedabad 380 009, India email: susanta@prl.res.in
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Abstract

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We have examined solar polar fields during the solar cycles 21–23 using both ground and space based synoptic magnetograms. It has been shown that the unsigned polar fields in the latitude range (78°–90°) show a steady decline starting ~1995–1996 till the maximum of cycle 23. We also find that the long term changes in the unsigned polar fields at higher latitudes are well correlated with changes in the surface meridional flow speed that have been reported for the cycle 23.

Keywords

Sun: magnetic fieldsSolar cycleand Meridional flow
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S294: Solar and Astrophysical Dynamos and Magnetic Activity , August 2012 , pp. 81 - 82
Copyright
Copyright © International Astronomical Union 2013 

References

Hathaway, D. H. & Rightmire, L. 2010, Science, 327, 1350 CrossRefGoogle Scholar
Janardhan, P., Bisoi, S. K., & Gosain, S. 2010, Solar Phys., 267, 267 CrossRefGoogle Scholar