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【摘 要】
：
We examine the nonlinear dynamical properties of the monthly smoothed group sunspot number Rg and find that the solar activity underlying the time series of Rg
【机 构】
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NationalAstronomicalObservatories/YunnanObservatory,GraduateSchoolofChineseAcademyofSciences
【出 处】
：
中国天文和天体物理学报：英文版
【发表日期】
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2007年3期
【基金项目】
：
Supported by the National Natural Science Foundation of China.Acknowledgements This work is funded by the National Natural Science Foundation of China （Grants 10573034 and 40636031）, the 973 project （
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