Physics
Scientific paper
Jun 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.2666t&link_type=abstract
Journal of Geophysical Research, vol. 84, June 1, 1979, p. 2666-2674. Research supported by the National Academy of Sciences
Physics
9
Decametric Waves, Io, Jupiter (Planet), Planetary Radiation, Atmospheric Models, Beams (Radiation), Lines Of Force, Radiation Distribution, Radiation Sources, Jupiter, Io, Satellites, Decameter Waves, Models, Flux, Magnetic Fields, Morphology, Radiation, Radioemissions, Emissions, Review, Occultations, Polarization, Megahertz
Scientific paper
The paper compares observational results of Jupiter's decametric radiation with the beaming directions predicted by emission of a wide-angle conical sheet of radiation. Using the conical beaming model, beaming directions were calculated assuming a source region above the planetary surface along the Io-affected magnetic flux tube at a point where the electron gyrofrequency is equal to the radiated frequency. The analysis is based on the octupolar magnetic field models from the Pioneer 11 measurements, and an apparent displacement of the flux tube 20 deg ahead of the Io orbital position produces agreement between the calculated and observed positions of the sources. The longitudinal extents of the three main sources are approximated by limiting radiation to points where the angle between the magnetic field vector at the point of emission and the Zenographic equatorial plane is at a minimum. For lower frequencies the Io-dependent radiation is emitted at all longitudes, and the beaming model concurs with this conclusion when all cutoffs are eliminated.
Smith Alex. G.
Thieman James R.
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