22-year cycle of differential rotation of the solar corona and the rule by Gnevyshev-Ohl
Abstract
The time variation of the parameters of differential rotation of the solar corona is considered based on data on the coronal green-line brightness. Separate analysis is performed for even and odd cycles. It is shown that the equatorial rotation rate of the corona increases in the epochs of minimum between the even and odd cycles and reaches its minimum values between the odd and even cycles. Besides, it is found that the differential rotation gradient in absolute value increases in the even cycles. Both these factors may act to increase the amplitude of the odd cycle compared to the preceding even one. Perhaps, this is what explains the effect of Gnevyshev-Ohl.
- Publication:
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Monthly Notices of the Royal Astronomical Society
- Pub Date:
- April 2017
- DOI:
- 10.1093/mnras/stx134
- Bibcode:
- 2017MNRAS.466.4535B
- Keywords:
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- Sun: corona;
- Sun: rotation