Physics
Scientific paper
Nov 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3122604l&link_type=abstract
Geophysical Research Letters, Volume 31, Issue 22, CiteID L22604
Physics
3
Geomagnetism And Paleomagnetism: Dynamo Theories, Geomagnetism And Paleomagnetism: Core Processes (8115), Geomagnetism And Paleomagnetism: Geomagnetic Induction, Geomagnetism And Paleomagnetism: Rapid Time Variations, Geomagnetism And Paleomagnetism: Reversals (Process, Timescale, Magnetostratigraphy)
Scientific paper
Earth's magnetic field, generated by fluid motion and inductive processes in Earth's core, has a predominantly axisymmetric dipolar component. Yet indefinite self-excitation of purely axisymmetric fields through any dynamo mechanism is specifically disallowed, begging the question of why the geodynamo sustains this dominant axisymmetric component. By considering a number of different fluid flow models modified from existing studies, we show that axisymmetric fields are consistently the most easily regenerated magnetic fields on short timescales, despite the fact that on long timescales they must die away. We argue that this transient field generation may play an important role in generating Earth's magnetic field, especially in the recovery after reversals.
Jackson Andrew
Livermore Philip W.
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