منابع مشابه
Periodicities in the Io plasma torus
We present a 6-month basehne of spattally resolved measurements of the Io plasma torus intensity and perpendicular ion temperature which we use to determine the periodicities of the torus during this time. We find large anticorrelated variations in the intensity and ion temperature which are periodic with the Jovian rotation rate (System III). The intensity variations are found to be a simple m...
متن کاملNo effect on the Io plasma
Observations of the Io plasma torus made before, during, and after the impact of Comet Shoemaker-Levy 9 with Jupiter reveal no cometinduced changes. Three weeks of high spectralresolution ground-based visible spectroscopy show no changes larger than typical day-to-day variations in the torus densities, ion temperatures, or rotation velocities. Comparison with six months of identically obtained ...
متن کاملElectromagnetic interaction between Jupiter’s ionosphere and the Io Plasma torus
The electromagnetic interaction between Jupiter and Io has been studied extensively since the discovery of Io-controlled decametric radio emissions (DAMs). A variety of mechanisms for electromagnetic disturbances have been considered including a unipolar inductor, the excitation of large-amplitude Alfvén waves, the generation of electrostatic electric fields parallel to the ambient magnetic fie...
متن کاملJovian dust streams: Probes of the Io plasma torus
Jupiter was discovered to be a source of high speed dust particles by the Ulysses spacecraft in 1992. These dust particles originate from the volcanic plumes on Io. They collect electrostatic charges from the plasma environment, gain energy from the co-rotating electric field of the magnetosphere, and leave Jupiter with escape speeds over 200 kms. The dust streams were also observed by the Gali...
متن کاملSpatial Distribution of Plasma in the Io Torus
In situ measurements of ion densities and temperatures have been analyzed to produce profiles of these plasma parameters along the Voyager 1 inbound trajectory between 7 and 5 R j. The temperature profile shows a sharp decrease by a factor of •,,50 between 5.8 and 5.2Rj corresponding to a temperature gradient of •,7 x l0 s per R r The electron density profile, inferred from the ion density meas...
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ژورنال
عنوان ژورنال: Journal of Geophysical Research
سال: 1980
ISSN: 0148-0227
DOI: 10.1029/ja085ia11p05959