Contrasting the solar rotation rate of cycles 23 and 24

Eclipse on the Coral Sea: Cycle 24 Ascending

物理学;天文学

Antia, H.M.^1 ; Basu, Sarbani^2

Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400005, India^1

Department of Astronomy, Yale University, P. O. Box 20801, New Haven, CT 06520-8101, United States^2

关键词: Rotation rate;    Solar cycle;    Solar rotation;    Zonal flows;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/440/1/012018/pdf
DOI  :  10.1088/1742-6596/440/1/012018

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

The minimum between solar cycles 23 and 24 was quite unusual compared with other minima for which detailed data are available and this pointed to the possibility that cycle 24 will be unusual. Cycle 24 is almost at its maximum now and we take this opportunity to compare and contrast the solar rotation rate and zonal flows between the two cycles. We find that the rotation rate during cycle 24 is slightly lower than that during cycle 23. Additionally we find that the poleward branch of the zonal flow that is believed to be the harbinger of the next solar cycle is very week in cycle 24.