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Chinese sunspot drawings and their digitization − (IV) differential rotation profile determined from hand-drawing records
Journal of Astrophysics and Astronomy ( IF 1.1 ) Pub Date : 2021-07-13 , DOI: 10.1007/s12036-021-09766-8
Xiao-Yu Luo 1 , Yang Peng 1, 2 , Sheng Zheng 1 , Shu-Guang Zeng 1 , Lin-Hua Deng 2, 3 , Yong-Li Feng 2 , Jin-Ping Tao 2
Affiliation  

It is necessary to better understand the dynamic process of solar differential rotation. Here the hand-drawing sunspot group records from 1958 to 2015 of Yunnan Observatories (YNAO) are used to study the solar rotation profile. Firstly, the rotation profile in each solar cycle 19-23 is calculated. Secondly, the rotation parameters (equatorial rotation velocity A and differential gradient B) of YNAO are compared with the well-known earlier results. Finally, the rotation parameters in the northern and southern hemispheres during each solar cycle 19-23 are summarized. The main conclusions we reached are as follows: (1) The average difference of the equatorial rotation velocity and differential gradient, between YNAO sunspot and other sunspot datasets, are 0.09 and 0.4, respectively. (2) The magnitudes of the gradient B in the northern hemisphere are larger than that in the southern hemisphere at even-number cycles, and it will approximately reverse at odd-number cycles.

更新日期:2021-07-13
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