Chinese sunspot drawings and their digitization − (IV) differential rotation profile determined from hand-drawing records
| العنوان: | Chinese sunspot drawings and their digitization − (IV) differential rotation profile determined from hand-drawing records |
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| المؤلفون: | Sheng Zheng, Shu-Guang Zeng, Xiao-Yu Luo, Jin-Ping Tao, Linhua Deng, Yang Peng, Yong-Li Feng |
| المصدر: | Journal of Astrophysics and Astronomy. 42 |
| بيانات النشر: | Springer Science and Business Media LLC, 2021. |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | Physics, Sunspot, Northern Hemisphere, Astronomy and Astrophysics, Astrophysics, Rotation, Geodesy, Solar cycle, Space and Planetary Science, Physics::Space Physics, Rotation velocity, Astrophysics::Solar and Stellar Astrophysics, Differential rotation, Solar rotation, Astrophysics::Earth and Planetary Astrophysics, Southern Hemisphere |
| الوصف: | 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. |
| تدمد: | 0973-7758 0250-6335 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::d72b425016427ad796e3ac5c7aa89d20 https://doi.org/10.1007/s12036-021-09766-8 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi...........d72b425016427ad796e3ac5c7aa89d20 |
| قاعدة البيانات: | OpenAIRE |
Find this article in full text from Springer Verlag. | تدمد: | 09737758 02506335 |
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