The geomagnetic field over the past 5 million years.

Details The geomagnetic field over the past 5 million years. The geomagnetic field over the past 5 million years.

Feb 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997geoji.128..315k&link_type=abstract

Geophysical Journal International, Vol. 128, No. 2, p. 315 - 330

Physics

46

Geomagnetic Field: Palaeomagnetism, Geomagnetic Field: Models

Scientific paper

The modern geomagnetic field is usually expressed as a spherical harmonic expansion. Although the palaeomagnetic record is very incomplete in both space and time, sufficient data are available from a span of ages to generate time-averaged spherical harmonic field models with many degrees of freedom. Here three data sets are considered: directional measurements from lavas, inclination measurements from ocean sediments, and intensity measurements from lavas. Individual data are analysed, as well as site-averages, using the same methods that have been developed for the modern field, to give models for the past 5 Myr.

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