Does secular variation involve motions in the deep core?

Details Does secular variation involve motions in the deep core? Does secular variation involve motions in the deep core?

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pepi...82..185j&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 82, Issue 3-4, p. 185-193.

Physics

4

Scientific paper

The time evolution, or secular variation, of different components of the geomagnetic field at many observatories presents a broken-line pattern. Along time invervals whose length is typically a few tens of years the secular variation is linear (or the field is parabolic), with a high accuracy. Sudden changes of slope take place at the ends of these intervals, identified as magnetic jerks. We show that it is difficult to make these characteristics compatible with the hypothesis that the secular variation is generated by a flow involving only a thin-say of the order of 10 km-layer at the top of the core. Indeed diffusion would then prohibit the observed broken line pattern and its linear parts, unless rather unlikely assumptions are made about the time behaviour of the flow.

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