Periodic intensity variation in [SIII] 9531A emission from the Jupiter plasma torus

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Abstract
The intensity variation of [SIII] 9531 A line emission from the hot plasma torus of Jupiter was measured from Kitt Peak National Observatory during April 1982 using a scanning Fabry‐Perot spectrometer with a field of view 2 RJ in diameter centered at 6 RJ on the centrifugal equator. During the observational period, which covered 43 rotations of Jupiter, the intensities showed a periodic variation consistent with a zone of enhanced emission approximately 90° in longitude rotating with a period of 10.2 hours, or 2.8% longer than Jupiter' rotational period.