Solar Rotation Rate during Solar Activity Cycle 23 |
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Authors: | Miyoshi Suzuki |
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Institution: | (1) Mie University, Tsu City Mie Prefecture, 514-8507, Japan |
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Abstract: | We studied the solar rotation rate and its temporal change, using the sunspot data obtained during activity cycle 23 (1996 – 2006).
The equatorial rotation rate is nearly the same as in the former cycle 22, while the latitudinal gradient of differential
rotation considerably increased. Comparison of our results with others indicates the existence of a long-term periodicity
of about eight cycles in differential rotation. In addition, no significant asymmetry in differential rotation between the
northern and southern hemispheres during cycle 23 was found. The equatorial rotation rate and the latitudinal gradient of
the differential rotation in the period of cycle 23 are approximately constant, except for the initial and final phases in
the cycle. |
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