Was the 1970 geomagnetic jerk of internal or external origin

Details Was the 1970 geomagnetic jerk of internal or external origin Was the 1970 geomagnetic jerk of internal or external origin

Apr 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982natur.296..726m&link_type=abstract

Nature, vol. 296, Apr. 22, 1982, p. 726-728.

Physics

65

Geomagnetism, Acceleration (Physics), Conductivity, Earth Core, Earth Mantle, Harmonic Analysis, Secular Variations

Scientific paper

Annual mean data from worldwide magnetic observatories show that there was a jerk (step-change in the second time derivative) in the geomagnetic field, which took place over an interval of less than 2 yr around 1970. If such a short-lived phoenomenon originated in the earth's core, and was still detectable after passing through the mantle to the surface, this would imply a much lower conductivity for the lower mantle than had been believed previously. Here it is shown by an objective test that most of the jerk has an internal origin.

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