The variation of intensity of earth's magnetic field with time

Details The variation of intensity of earth's magnetic field with time The variation of intensity of earth's magnetic field with time

Aug 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002pepi..131..237h&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 131, Issue 3-4, p. 237-249.

Physics

21

Scientific paper

A new and larger database is established to assess the variation of paleointensity with time. It is shown that submarine basaltic glass probably contains a grain-growth chemical remanent magnetization in magnetite. Intensity estimates from these samples are used to establish a lower bound estimate on intensities. Statistical tests on various subsets of the database are used to establish a more reliable database for finding long-term trends of the paleointensity. We can obtain a reasonable estimate for intensity versus time for the Cenozoic but not for the Mesozoic or late Paleozoic. The distributions of data as a function of time also provide valuable information. In particular, the two well-documented superchrons exhibit different intensity properties, which suggests that there is not a simple correlation between reversal rate and intensity.

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