The response of thunderstorm VLF radio noise to solar activity according to observations in Yakutsk

Physics

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Scientific paper

The relation between the long-term variations in the thunderstorm VLF radio noise intensity and solar activity in 1979-2006 has been studied. The sunspot number (the Wolf number) was used as a parameter characterizing solar activity. The intensity of VLF noise registered in Yakutsk characterizes thunderstorm activity in Eastern Siberia (0100-0500 UT) and in the African thunderstorm center (1300-1700 UT). Using the results of a correlation analysis, it has been found that thunderstorm activity in Eastern Siberia and in the African world centre is in antiphase with a change in the sunspot number. The highest anticorrelation coefficients between solar activity and thunderstorm discharge intensity were obtained for thunderstorms in Eastern Siberia. In this case the maximal correlation coefficients ( R = -0.59 and -0.75) were obtained for the average monthly values of the VLF radio noise intensity in August, measured at 0400 UT and 1600 UT, respectively.

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