Geomagnetic jerks characterization via spectral analysis

In this study we have applied spectral techniques to analyze geomagnetic field time-series provided by observatories, and compared the results with those obtained from analogous analyses of synthetic data estimated from models. Then, an algorithm is here proposed to detect the geomagnetic jerks in t...

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Published inSolid earth (Göttingen) Vol. 3; no. 1; pp. 131 - 148
Main Authors Duka, B, De Santis, A, Mandea, M, Isac, A, Qamili, E
Format Journal Article
LanguageEnglish
Published Gottingen Copernicus GmbH 01.01.2012
Copernicus Publications
Subjects
Comparative analysis
Earth science
Evolution (Biology)
Geomagnetic field
Spectral analysis
Time series
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Summary:In this study we have applied spectral techniques to analyze geomagnetic field time-series provided by observatories, and compared the results with those obtained from analogous analyses of synthetic data estimated from models. Then, an algorithm is here proposed to detect the geomagnetic jerks in time-series, mainly occurring in the eastern component of the geomagnetic field. Applying such analysis to time-series generated from global models has allowed us to depict the most important space-time features of the geomagnetic jerks all over the globe, since the beginning of XXth century. Finally, the spherical harmonic power spectrum of the third derivative of the main geomagnetic field has been computed from 1960 to 2002.5, bringing new insights to understand the spatial evolution of these rapid changes of the geomagnetic field.
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ISSN:1869-9529
1869-9510
1869-9529
DOI:10.5194/se-3-131-2012