Analysis of ~21.5 d Period in Ionospheric and Solar Indices during 2011

doi:10.11947/j.AGCS.2017.20160067

Abstract

Abstract: By using Fourier transform, the spectrum of total electron content(TEC) data, relative sunspot number(RSSN), solar extreme ultraviolet(EUV) flux in 0.1~50 nm and 26~34 nm were performed to study the ~27 d period in solar-terrestrial environment. A~21.5 d period was found in TEC and solar indices, while geomagnetic indices showed no sign of this period. We infer that the ~21.5 d period could combined effects of solar rotation and active region evolution. Results of the past few solar cycles show that 21~23 d of quasi-periodic 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 ~21.5 d period 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 ~27 d period oscillation.

Key words: ionosphere, solar rotation, EUV

CLC Number:

P227

YAO Yibin, ZHANG Shun, KONG Jian. Analysis of ~21.5 d Period in Ionospheric and Solar Indices during 2011[J]. Acta Geodaetica et Cartographica Sinica, 2017, 46(1): 9-15.

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