Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.3561k&link_type=abstract
Geophysical Research Letters, Volume 28, Issue 18, p. 3561-3564
Astronomy and Astrophysics
Astronomy
6
Geomagnetism And Paleomagnetism: Dynamo Theories, Geomagnetism And Paleomagnetism: Geomagnetic Excursions, Geomagnetism And Paleomagnetism: Paleointensity, Geomagnetism And Paleomagnetism: Reversals (Process, Timescale, Magnetostratigraphy)
Scientific paper
A ~41 Kyr periodic component has been reported in some sedimentary paleointensity records, allowing speculation that there may be some component of orbital control of geomagnetic field generation such as by obliquity modulation. However, no discernable tendency is found for astronomically-dated geomagnetic reversals in the Plio-Pleistocene (0 to 5.3 Ma) or excursions in the Brunhes (0 to 0.78 Ma) to occur at a consistent amplitude or phase of obliquity cyclicity, nor of orbital eccentricity. An implication is that paleointensity lows which are characteristically associated with these features are not distributed in a systematic way relative to obliquity and eccentricity, supporting the idea that orbital forcing does not power the geodynamo.
Carlut Julie
Kent Dennis V.
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