Long-Term Variations of Solar Differential Rotation and Sunspot Activity: Revisited

被引：22
作者：
Li, K. J. [1 ,2 ]
Feng, W. [3 ]
Shi, X. J. [1 ,4 ]
Xie, J. L. [1 ,4 ]
Gao, P. X. [1 ]
Liang, H. F. [5 ]
机构：
[1] Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, Kunming 650011, Peoples R China
[2] Chinese Acad Sci, Natl Astron Observ, Key Lab Solar Act, Beijing 100012, Peoples R China
[3] Kunming Univ Sci & Technol, Res Ctr Anal & Measurement, Kunming 650093, Peoples R China
[4] Chinese Acad Sci, Grad Sch, Beijing 100863, Peoples R China
[5] Yunnan Normal Univ, Dept Phys, Kunming 650093, Peoples R China
来源：
SOLAR PHYSICS | 2014年 / 289卷 / 03期
基金：
中国国家自然科学基金;
关键词：
Rotation; Solar cycle; observations; Sunspots; velocity; NORTH-SOUTH ASYMMETRY; BRIGHTNESS-TEMPERATURE REGIONS; TORSIONAL OSCILLATIONS; TEMPORAL VARIATIONS; MERIDIONAL MOTIONS; MAGNETIC-FIELD; MOUNT WILSON; FILAMENTS; PATTERNS; VELOCITY;
D O I：
10.1007/s11207-013-0369-6
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Long-term variations of solar differential rotation and sunspot activity are investigated through re-analyzing the data on parameters of the differential-rotation law obtained by Makarov, Tlatov, and Callebaut (Solar Phys. 170, 373, 1997), Javaraiah, Bertello, and Ulrich (Astrophys. J. 626, 579, 2005a; Solar Phys. 232, 25, 2005b), and Javaraiah et al. (Solar Phys. 257, 61, 2009). Our results indicate that the solar-surface-rotation rate at the Equator (indicated by the A-parameter of the standard solar-rotation law) shows a secular decrease since Cycle 12 onwards, given by about 1 - 1.5 x 10(-3) (deg day(-1) year(-1)). The B-parameter of the standard differential-rotation law seems to also show a secular decrease since Cycle 12 onwards, but of weak statistical significance. The rotation rate averaged over latitudes 0 degrees-40 degrees does not show a secular trend of statistical significance. Moreover, the average sunspot area shows a secular increase of statistical significance since Cycle 12 onwards, while a negative correlation is found between the level of sunspot activity (indicated by the average sunspot area) and the solar equatorial rotation on long-term scales.
引用
收藏
页码：759 / 768
页数：10
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