Mathematics – Logic
Scientific paper
Feb 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...301..471s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 301, Feb. 1, 1986, p. 471-477. NSERC-supported research.
Mathematics
Logic
5
Phase Modulation, Secular Variations, Solar Oscillations, Stellar Motions, Cratering, Epicycloids, Extinction, Geomagnetism, Interstellar Matter, Magnetic Field Inversions, Phase Shift
Scientific paper
The Sun's oscillations perpendicular to the Galactic disk have been invoked to explain apparent periodicities in the dates of terrestrial mass extinctions, the ages of impact craters, and the times of reversals of the Earth's magnetic field. In this work it is shown that these oscillations are expected to be phase modulated, as a result of the epicyclic motion of the Sun about the Galactic center. Consequences of the phase modulation are that the period of the z oscillations averaged over the past 250 Myr (the time scale of the geological data) is ≡8% greater than the present value, and that it is possible to devise a phase correction to enhance the periodicities in the geological data. The analysis suggests a possible connection between the dates of mass extinctions and the Sun's z oscillations. It also confirms the existence of a highly significant periodicity in the geomagnetic data, which may be related to the Sun's Galactic rotation period or the epicyclic period.
Klatt Calvin
Shuter William L. H.
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