Geomagnetic reversals from impacts on the earth

Details Geomagnetic reversals from impacts on the earth Geomagnetic reversals from impacts on the earth

Nov 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986georl..13.1177m&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 13, Nov. 1986, p. 1177-1180. DOE-supported research.

Physics

26

Geomagnetism, Impact Damage, Polarity, Reversing, Climate Change, Cratering, Extinction, Magnetic Field Inversions, Tektites

Scientific paper

The impact of a large extraterrestrial object on the earth can produce a geomagnetic reversal through the following mechanism: dust from the impact crater and soot from fires trigger a climate change and the beginning of a little ice age. The redistribution of water near the equator to ice at high latitudes alters the rotation rate of the crust and mantle of the earth. If the sea-level change is sufficiently large and rapid, then the velocity shear in the liquid core disrupts the convective cells that drive the dynamo. The new convective cells that subsequently form distort and tangle the previous field, reducing the dipole component near to zero while increasing the energy in multipole components. Eventually a dipole is rebuilt by dynamo action, and the event is seen either as a geomagnetic reversal or as an excursion. Several testable predictions are made.

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