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On the Long-Term Modulation of Solar Differential Rotation
Suzuki, M.
AA(Mie University, Tsu, Mie Prefecture, Japan)
Solar Physics, Volume 289, Issue 11, pp.4021-4029 (SoPh Homepage)
Publication Date:
Rotation, Solar cycle, observations
Abstract Copyright:
(c) 2014: Springer Science+Business Media Dordrecht
Bibliographic Code:


Long-term modulation of solar differential rotation was studied with data from Mt. Wilson and our original observations during Solar Cycles 16 through 23. The results are that i) the global B-value ( i.e. latitudinal gradient of differential rotation) is modulated with a period of about six or seven solar cycles, ii) the B-values of the northern and southern hemispheres are also modulated with a period similar to the global one, but iii) they show quasi-oscillatory behavior with a phase shift between them. We examined the yearly fluctuations of the B-values in every solar cycle with reference to the phase of the sunspot cycle and found that the B-values in the sunspot-minimum years show large and erratic variations, while those in the sunspot-maximum years show small fluctuations. Positive correlation between the former B-values and the latter was found. We discuss the independent long-term behavior of solar differential rotation between the northern and southern solar hemispheres and the implication for the solar dynamo.
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