Electromagnetic response of the mantle to long-period geomagnetic variations over the globe

Details Electromagnetic response of the mantle to long-period geomagnetic variations over the globe Electromagnetic response of the mantle to long-period geomagnetic variations over the globe

Aug 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998ep%26s...50..651h&link_type=abstract

Earth, Planets and Space, Volume 50, p. 651-662.

Physics

6

Scientific paper

Long-period electromagnetic response must be estimated to derive information on the electrical conductivity distribution within the deep mantle of the Earth. For this, we estimated the electromagnetic response function for long-period geomagnetic variations, on the basis of the P1 approximation. The data used for analyses are geomagnetic daily mean values for 10 years (1965-1974) from 59 stations distributed over the globe and for about 20 years (1960-1980) from 9 stations. It turned out that the P1 approximation generally holds except for the periods corresponding to annual and semi-annual variations. We also found that accurate estimation is difficult for periods longer than a few years, probably because of contamination due to secular variations of core origin.

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