Frequency Variation of the Earth's Obliquity and the Geomagnetic Intensity Cycles

Details Frequency Variation of the Earth's Obliquity and the Geomagnetic Intensity Cycles Frequency Variation of the Earth's Obliquity and the Geomagnetic Intensity Cycles

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufm.u72b0026l&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #U72B-0026

Astronomy and Astrophysics

Astronomy

1243 Space Geodetic Surveys, 1521 Paleointensity, 3220 Nonlinear Dynamics, 8121 Dynamics, Convection Currents And Mantle Plumes

Scientific paper

Frequency modulation of the Earth's obliquity has provided an insight into the liquid core of the Earth that generates intensity cycles in the geomagnetic field. Calculations of the obliquity variations have reveled a series of frequency cycles which are almost identical with the spectral peaks from the composite curve of 33 records of relative paleointensity spanning the past 800 Kyr. A continuous record for the past 2 million years also reveals the presence of the major 100-Kyr periodicity in obliquity frequency and geomagnetic intensity. Thus the Earth's obliquity variation is a possible astronomical forcing mechanism, which drives the geomagnetic intensity cycles.

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