Astronomy and Astrophysics – Astronomy
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...177..303g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 177, no. 1-2, May 1987, p. 303-309.
Astronomy and Astrophysics
Astronomy
7
Decametric Waves, Io, Jupiter Atmosphere, Planetary Magnetic Fields, Planetary Radiation, Radio Sources (Astronomy), High Energy Electrons, High Frequencies, Planetary Magnetospheres, Visibility, Voyager Project, Jupiter, Satellites, Io, Radio Waves, Emissions, Decameter Waves, Pra, Frequencies, Planetary Radio Astronomy Experiment, Source, Distribution, Voyager Missions, Electrons, Trapping, Injection, Origin, Magnetosphere, Energy, Flux Tube, Spectra
Scientific paper
The exhaustive measurements of the high frequency limit of the Jovian decameter emission, from the data of the Planetary Radio Astronomy experiment aboard the two Voyager spacecraft (Aubier and Genova, 1985), are used to study the non-Io-dependent emissions. It is found that these emissions can in general be triggered by trapped electrons, and that freshly injected electrons are needed only in a few cases, to account for emissions at frequencies higher than possible with trapped electrons. On the other hand, Io-dependent emissions are produced mostly by freshly injected electrons. It is confirmed that the observations of emissions at high frequency are consistent with the possible source location deduced from the multipole magnetic field model of Pioneer 11 in the northern hemisphere. It is found that some Io emissions, and a few non-Io ones, are observed although they are radiated from behind the limb of the planet, probably after complex propagation effects which produce peculiar patterns in the dynamic spectra.
Aubier M. G.
Genova Francoise
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