Ground-based observations of the Jupiter plasma torus

Details Ground-based observations of the Jupiter plasma torus Ground-based observations of the Jupiter plasma torus

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986plas.rept...53s&link_type=abstract

In NASA, Washington Reports of Planetary Astronomy, 1985 p 53-54 (SEE N87-12407 03-89)

Astronomy and Astrophysics

Astronomy

Jupiter (Planet), Planetary Composition, Planetary Radiation, Plasma Conductivity, Toroidal Plasmas, Fabry-Perot Spectrometers, Magnetic Fields, Magnetospheric Instability, Magnetospheric Ion Density, Planetary Magnetospheres, Planetary Rotation

Scientific paper

The intensity variation of (SIII) 9531 A emission from the hot plasma torus of Jupiter was measured using a scanning Fabry-Perot spectrometer. During the observational period, which covered 43 rotations of Jupiter, the (SIII) intensities showed a periodic variation consistent with a zone of enhanced emission approximately 90 deg in longitude, rotating with a period of 10.2 hours, or 2.8% longer than Jupiter's rotational period. Dessler developed a theoretical model of account for Jovian magnetospheric phenomena that differ in repetition period by 3%. In his model, periodic modulation of magnetospheric phenomena is controlled in part by the spin period of magnetic features below the surface of the planet. The differing observed periods are then due to differential rotation of the subsurface magnetic features at different latitudes. A consequence that follows from this concept of differential rotation of the internal planetary magnetic field is that not all the apparent subcorotational plasma flow in the torus is caused by plasma mass loading, as described by Hill and his associates. As a result, the mass loading required to produce the residual subcorotational flow is less than previously estimated.

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