Other
Scientific paper
Aug 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983georl..10..713n&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 10, Aug. 1983, p. 713-716.
Other
41
Geomagnetism, Magnetic Dipoles, Magnetic Field Inversions, Milky Way Galaxy, Periodic Variations, Solar System, Magnetic Signatures, Paleomagnetism, Reversing, Walsh Function
Scientific paper
The phenomenon of frequent axial geocentric dipole field reversals is presently addressed by applying a Walsh spectrum analysis scheme to the available, world-wide paleomagnetic measurements for the phanerozoic period (which covers the last 570 million years). The results obtained clearly postulate long term cyclicity in magnetic stratigraphy, with reversal periods of 285, 114, 64, 47, and 34 million years, and a repetition of the analysis points to periods of 71, 47, and 32 million years with 90 percent statistical confidence. These results undercut the widely accepted theory of random geomagnetic reversal in long period sequences. Maximum spectral power is found for the Cosmic Year of 285 million years, or the period of the solar system's complete revolution around the Galactic center. The other reversal periods correspond with the solar system's periods of galactocentric radial motion, the interaction of the spiral density wave with the galactic orbit, and solar oscillations in and outside of the orbital plane.
Negi Janardan G.
Tiwari Rajesh Kumar
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