December 18, 2009 Journal article Open Access

Agata Siniscalchi; M. Iorio; G. Giberti; Stefano Lorito

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    <subfield code="a">We present Continuous Wavelet Transform (CWT) data analysis of Virtual Geomagnetic Pole (VGP) latitude
 time series. The analyzed time series are sedimentary paleomagnetic and geodynamo simulated data. Two mother
 wavelets (the Morlet function and the first derivative of a Gaussian function) are used in order to detect features
 related to the spectral content as well as polarity excursions and reversals. By means of the Morlet wavelet,
 we estimate both the global spectrum and the time evolution of the spectral content of the paleomagnetic data
 series. Some peaks corresponding to the orbital components are revealed by the spectra and the local analysis
 helped disclose their statistical significance. Even if this feature could be an indication of orbital influence on
 geodynamo, other interpretations are possible. In particular, we note a correspondence of local spectral peaks
 with the appearance of the excursions in the series. The comparison among the paleomagnetic and simulated
 spectra shows a similarity in the high frequency region indicating that their degree of regularity is analogous. By
 means of Gaussian first derivative wavelet, reversals and excursions of polarity were sought. The analysis was
 performed first on the simulated data, to have a guide in understanding the features present in the more complex
 paleomagnetic data. Various excursions and reversals have been identified, despite of the prevalent normality of
 the series and its inherent noise. The found relative chronology of the paleomagnetic data reversals was compared
 with a coeval global polarity time scale (Channel et al., 1995). The relative lengths of polarity stability intervals
 are found similar, but a general shift appears between the two scales, that could be due to the datation uncertainties
 of the Hauterivian/Barremian boundary.</subfield>
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    <subfield code="a">Wavelet analysis on paleomagnetic (and computer simulated) VGP time series</subfield>
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    <subfield code="a">10.4401/ag-3429</subfield>
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