Physics
Scientific paper
Aug 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984natur.310..755d&link_type=abstract
Nature (ISSN 0028-0836), vol. 310, Aug. 30, 1984, p. 755-757.
Physics
44
Magnetic Moments, Planetary Magnetic Fields, Planetary Radiation, Radio Emission, Solar Planetary Interactions, Uranus (Planet), Nonthermal Radiation, Planetary Magnetospheres, Plasma Interactions, Radiant Flux Density, Radio Bursts, Solar Wind
Scientific paper
Determinations by spacecraft of the low-frequency radio spectra and radiation beam geometry of the magnetospheres of earth, Jupiter, and Saturn now permit a reliable assessment of the overall efficiency of the solar wind in stimulating intense, nonthermal radio bursts from these magnetospheres. It is found that earlier estimates of how magnetospheric radio output scales with the solar wind energy input must be greatly revised, with the result that, while the efficiency is much lower than previously thought, it is remarkably uniform from planet to planet. A 'radimetric Bode's law' is formulated from which a planet's magnetic moment can be estimated from its radio emission output. This law is applied to estimate the low-frequency radio power likely to be measured for Uranus by Voyager 2. It is shown how measurements of Uranus's radio flux can be used to estimate the planetary magnetic moment and solar wind stand-off distance before the in situ measurements.
Desch Michael D.
Kaiser Michael L.
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