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- W52444761 abstract "After a brief review of a nonlinearity test based on information theoretic functionals (redundancies) and surrogate data technique, we discuss problems of this and similar tests for nonlinearity. In particular, we stress that a formal rejection of a linear stochastic null hypothesis does not automatically mean evidence for nonlinear dynamical origin of studied data. In an example we show how a variable variance could be mistaken for nonlinearity in a series of surface air pressures. Therefore we find a detection of nonlinearity in a series of sunspot numbers insufficient for an identification of a mechanism underlying the sunspot cycle. As a solution in this case we propose to test for a property of nonlinear oscillators — mutual dependence between their instantaneous amplitude and frequency. This behavior is detected m yearly and monthly records of the sunspot numbers using histogram-adjusted isospectral surrogate data and Barnes model as ARMA surrogates. The instantaneous amplitudes and frequencies are obtained by means of the analytic signal approach using the discrete Hilbert transform. In several tests the amplitude-frequency correlation has been found significant on levels ranging from p < 0.03 to p < 0.07, which supports the hypothesis of a driven nonlinear oscillator as a mechanism underlying the sunspot cycle." @default.
- W52444761 created "2016-06-24" @default.
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- W52444761 date "2001-01-01" @default.
- W52444761 modified "2023-10-04" @default.
- W52444761 title "Detection of a Nonlinear Oscillator Underlying Experimental Time Series: The Sunspot Cycle" @default.
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- W52444761 doi "https://doi.org/10.1007/978-1-4612-0177-9_19" @default.
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