Comparative analysis of long-term variations of duration of the day and solar activity over the period 1700–2003
We carried out the comparative analysis of long-term deviations of duration of the day from standard (86 400 sec) and solar activity over the period 1700–2003. For the comparative analysis mean annual data LOD were used, http://hpiers.obspm.fr/eop-pc/ and numbers of sunspots W, http://www.wdcb.ru/stp/.
The purpose of the analysis is a study of evolution of solar-terrestrial relations in terms of the insufficient physical information on the origin and interrelations of similar oscillations in irregular variations of duration of the day and parameters characterising solar activity. The analysis is carried out using 3 methods: periodogram, exponential approximation of data (method Prony) and wavelet transform.
Comparison of results of the analysis allows to draw a common conclusion: similar variations with ~ 11 and ~ 22-year periods in LOD and W data are coherent. The amplitude of a squared absolute value of coherence comprises 72% for 11-year and 74 % – for 22-year variations.
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