Wavelet entropy and the multi-peaked structure of solar cycle maximum |
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| Institution: | 1. Department of Civil and Earth Resources Engineering, Kyoto University, Katsura Campus, Nishikyo-ku, Kyoto, 615-8540, Japan;2. Graduate School of Engineering, Kyoto University, Katsura Campus, Nishikyo-ku, Kyoto, 615-8540, Japan |
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| Abstract: | Wavelet analysis of different solar activity indices—sunspot numbers, sunspot areas and flare index—allows us to investigate the time evolution of some frequency dependent functionals, like wavelet entropy, which gives useful information about the complexity level of the related signals. The main aim of this work is the analysis of the time behavior of wavelet entropy near the maximum phases of solar cycles 21–22–23 in order to further contribute to the characterization of the multi-peaked structure of solar cycle maxima and to support the current interpretation of the so-called Gnevyshev gap. |
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