[Show abstract][Hide abstract] ABSTRACT: We have assumed that the decameter radiation from Jupiter is produced near the local electron gyrofrequency and is amplified as it propagates out of the Jovian magnetosphere. We have derived the growth rate for radiation that propagates almost perpendicular to the direction of the magnetic field. When the electrons are described by a loss-cone distribution function, the growth rate is large enough to lead to a large amplification factor over a source of 100-4000 km, depending on the choice of parameters. Because we expect low-energy electrons to be trapped in the Jovian dipole field regardless of the position of the satellite Io, we maintain that this model provides a plausible mechanism for the decametric radiation not associated with Io.
The Astrophysical Journal 08/1972; · 6.73 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Space-probe observations of planetary magnetospheres are discussed. Three different categories of planetary magnetospheres are identified (intrinsic slowly rotating, intrinsic rapidly rotating, and induced), and the characteristics of each type are outlined. The structure and physical processes of the magnetospheres of Mercury, Mars, and Jupiter are described, and possible configurations are presented for the Martian and Jovian ones. Expected magnetic moments are derived for Saturn, Uranus, and Neptune. Models are constructed for possible induced magnetospheres of the moon, Mercury, Venus, Mars, and Io.
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