Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979natur.281..552r&link_type=abstract
Nature, vol. 281, Oct. 18, 1979, p. 552, 553.
Astronomy and Astrophysics
Astronomy
3
Dynamo Theory, Earth Planetary Structure, Planetary Magnetic Fields, Scaling Laws, Astronomical Models, Planetary Evolution, Planetary Structure, Planetology, Planets, Magnetohydrodynamics, Dynamo Theory, Dimensional Analysis, Scaling Laws, Satellites, Io, Models, Energy Sources, Comparisons, Predictions, Core Density, Magnetic Moments, Saturn, Mercury, Jupiter, Venus, Earth
Scientific paper
The scaling law for the strength of planetary magnetic dynamos is applied to planetary magnetic fields, and predictions regarding the magnetic moments of Saturn and Io are obtained. The scaling law is shown to predict accurately the observed ordering of the magnetic moments of the planets with known dynamos, however earth is found to exhibit an anomalously high moment when compared with Jupiter and Mercury. The magnetic moments of Venus and Mars are not found to correspond to scaling law predictions, suggesting the absence of a dynamo on these planets. From the assumptions of an anomalous terrestrial magnetic moment and the validity of the scaling law for Mercury and Jupiter, magnetic moments of 1.2 x 10 to the 29th and 6.5 x 10 to the 22nd G cu cm are predicted for Io and Saturn, respectively.
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