Time variations of the earth's magnetic field with a period longer than two months

Details Time variations of the earth's magnetic field with a period longer than two months Time variations of the earth's magnetic field with a period longer than two months

Aug 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976pepi...12..237c&link_type=abstract

(International Union of Geodesy and Geophysics, Symposium on Analysis, Processing and Interpretation of Geophysical Data, Grenob

Physics

Geophysics

1

Geomagnetism, Magnetic Variations, Periodic Variations, Secular Variations, Time Series Analysis, Earth Mantle, Harmonic Analysis, Solar Activity Effects, Solar Cycles, Spectrum Analysis, Visual Observation

Scientific paper

Visual inspection, aided by Burg's maximum entropy spectral analysis (MESA), was used to study time variations of monthly and annual mean values of absolute geomagnetic elements at a number of world observatories. After the removal of a parabolic trend, which takes into account the main part of the secular variation (SV) of internal origin, most of the remaining signal, for periods between two and approximately 20 years, could be associated with external sources (related to the solar cycle (SC)). No peaks in the spectra that could be related to phenomena of internal (core) origin were found. Large errors in the determination of the geometry of 11-year variations and its first harmonics, due mostly to local induction phenomena, prevent these data from providing precise constraints on the electrical conductivity of the deeper mantle.

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