Revisit of short-term periodicities in solar mean magnetic field  

作　　者：Zhiqiang Yin Jie Chen Yanben Han 

机构地区：[1]National Astronomical Observatories, Chinese Academy of Sciences

出　　处：《Chinese Science Bulletin》2014年第33期4478-4483,共6页

基　　金：supported by the National Basic Research Program of China(2012CB957801)

摘　　要：Short-term variations of the solar mean magnetic field(SMMF) were investigated through re-analyzing the data from the Wilcox Solar Observatory during the last four solar activity cycles using continuous wavelet transforms.We demonstrated the time-variable characters of short-term periods of SMMF. Our results indicate that the SMMF has main periods of about 27 and 13.5 days not only in the minimum and maximum years of each activity cycle, but also in the increase and decrease of the solar cycle. The result is partly different from the conclusion that the SMMF has dominant period of about 27 days during the solar maxima and about 13.5 days during the solar minimum years(Ye et al. in Solar Phys 279:411–418, 2012). The entire time span of SMMF was investigated and discussed further.Short-term variations of the solar mean magnetic field （SMMF） were investigated through re-analyzing the data from the Wilcox Solar Observatory during the last four solar activity cycles using continuous wavelet transforms. We demonstrated the time-variable characters of short-term periods of SMMF. Our results indicate that the SMMF has main periods of about 27 and 13.5 days not only in the minimum and maximum years of each activity cycle, but also in the increase and decrease of the solar cycle. The result is partly different from the conclusion that the SMMF has dominant period of about 27 days during the solar maxima and about 13.5 days during the solar minimum years （Ye et al. in Solar Phys 279：411418, 2012）. The entire time span of SMMF was investigated and discussed further.

关 键 词：太阳平均磁场 周期性 短期 太阳活动周期 连续小波变换 太阳物理学 时间变化 时间跨度 

分 类 号：P182.7[天文地球—天文学]