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We analyze in situ measurements of the solar wind velocity obtained by the Advanced Composition Explorer (ACE) and the Helios spacecraft during the years 1998 – 2012 and 1975 – 1983, respectively. The data mainly belong to solar cycles 23 (1996 – 2008) and 21 (1976 – 1986). We used the directed horizontal-visibility-graph (DHVg) algorithm and estimated a graph functional, namely, the degree distance...
We analyze in situ measurements of solar wind velocity obtained by the Advanced Composition Explorer (ACE) spacecraft during the solar activity cycle 23. We calculated a robust complexity measure, the permutation entropy (S) of the solar wind time series at different phases of a solar activity cycle. The permutation entropy measure is first tested on the known dynamical data, before its application...
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