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《Acta Geodaetica et Cartographica Sinica》 2017-01
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Analysis of ~21.5d Period in Ionospheric and Solar Indices during 2011

YAO Yibin;ZHANG Shun;KONG Jian;School of Geodesy and Geomatics,Wuhan University;Chinese Antarctic Center of Surveying and Mapping Wuhan University;  
By using Fourier transform,the spectrum of total electron content(TEC)data,relative sunspot number(RSSN),solar extreme ultraviolet(EUV)flux in 0.1~50nm and 26~34nm were performed to study the~27dperiod in solar-terrestrial environment.A~21.5dperiod was found in TEC and solar indices,while geomagnetic indices showed no sign of this period.We infer that the~21.5dperiod could combined effects of solar rotation and active region evolution.Results of the past few solar cycles show that 21~ 23 dof quasiperiodic signal will appear in the rising phase of a solar cycle.Using the solar active regions located in the[-10°,10°]slice,it is further confirmed that the~21.5dperiod observed in 2011 may be caused by the joint effects of solar active region complex and solar rotation.GIM data were used to study the global distribution of the~27d period oscillation.
【CateGory Index】: P352;P353
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