Periodicities in Global Mean TEC from GNSS Observations |
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| Authors: | L H Ma Y B Han Z Q Yin |
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| Institution: | (1) National Astronomical Observatories, Chinese Academy of Sciences, Beijing, 100012, People’s Republic of China |
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| Abstract: | As an important measurement parameter, global total electron content (TEC) is appropriate for the study of the Sun–Earth connection.
In this paper, the wavelet technique is employed to investigate the periodicities in global mean TEC during 1995–2008. Analysis
results show several remarkable components (including 27-day, semiannual and annual cycles) existing in global mean TEC with
obvious time-variable characteristics, besides 11-year cycle. After analyzing sunspot numbers and solar extreme ultra-violet
(EUV) radiation variations during this time period, except for semiannual variations, close correlation between global mean
TEC and solar variations is found, especially, a strong resemblance of the 27-day fluctuation exists in global mean TEC, sunspot
and solar EUV radiation variations. |
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| Keywords: | Global mean total electron content Wavelet transform Periodicity Solar activity |
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