Physics
Scientific paper
Feb 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93..979g&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 93, Feb. 1, 1988, p. 979-986. Research supported by the Observatoire de P
Physics
20
Decametric Waves, Jupiter (Planet), Planetary Magnetic Fields, Radio Emission, Io, Lines Of Force, Planetary Radiation, Statistical Analysis, Jupiter, Source, Radio Bursts, Emissions, Magnetic Fields, Beaming, Statistical Analysis, Satellites, Io, Flux Tube, Origin, Spectra, Decameter Waves, Procedure, Earth-Based Observations
Scientific paper
The location of the source of the Jovian S bursts was studied by comparing the high-frequency limit of these emissions, recorded in Nancay, to the surface gyrofrequency at the foot of the magnetic field lines which intersect Io's orbit, according to the O4 magnetic field model. For this purpose, the statistical occurrence of the S bursts was examined, both in central meridian longitude versus Io phase and as a function of the relative phase of Io with respect to Jupiter. The S bursts and the Io-dependent L emissions were found to originate from approximately the same locations at Jupiter, and probably under similar conditions of excitation by Io, although the beaming of these S emissions, which is indicated by the compactness of the occurrence patterns, was somewhat narrower than for the corresponding L emissions. Also, like the L emissions, an apparent delay of up to 70 deg was found to occur between the predicted instanteneous Io flux tube and the apparent source field line. The possible origin of this 70 deg delay is discussed.
Calvert Wesley
Genova Francoise
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