Spectral Analysis of Palaeomagnetic Time Series and the Geomagnetic Spectrum

Details Spectral Analysis of Palaeomagnetic Time Series and the Geomagnetic Spectrum Spectral Analysis of Palaeomagnetic Time Series and the Geomagnetic Spectrum

Aug 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982rspta.306..203b&link_type=abstract

Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, Volume 306, Issue 1492,

Physics

19

Scientific paper

There are now sufficient archaeomagnetic data from rapidly deposited sediments and baked clays to start bridging the gap in the geomagnetic spectrum between the frequency ranges covered by observatory records and polarity reversals. The form of the continuum spectrum of internal origin can be only loosely constrained but is broadly consistent with earlier speculations. The power spectral density function appears to increase rapidly with period up to periods of about 60 years, then more slowly up to a plateau in the region of 104 to 105 years, and thereafter starts to fall. There is somewhat inconclusive evidence for a drop in power density at periods around 102 years. Prospects for refining the spectrum are excellent.

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