Physics
Scientific paper
Oct 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....9111003c&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 91, Oct. 1, 1986, p. 11003-11008. NASA-supported research.
Physics
27
Dynamo Theory, Neptune Atmosphere, Planetary Magnetospheres, Field Strength, Maxima, Nonthermal Radiation, Scaling Laws, Triton, Voyager Project
Scientific paper
With the purpose of estimating Neptune's magnetic field and its implications for nonthermal Neptune radio emissions, a new scaling law for planetary magnetic fields was developed in terms of externally observable parameters (the planet's mean density, radius, mass, rotation rate, and internal heat source luminosity). From a comparison of theory and observations by Voyager it was concluded that planetary dynamos are two-state systems with either zero intrinsic magnetic field (for planets with low internal heat source) or (for planets with the internal heat source sufficiently strong to drive convection) a magnetic field near the upper bound determined from magnetostrophic balance. It is noted that mass loading of the Neptune magnetosphere by Triton may play an important role in the generation of nonthermal radio emissions.
Curtis Steven Andrew
Ness Norman F.
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