Planet. Space Sci.,48, 341 - 350, 2000
Abstract:
Magnetometer data from the Ulysses Jupiter flyby are examined, in
particular middle magnetosphere observations in the vicinity of
magnetodisk. Ion cyclotron waves are searched for in the heavy ion
gyrofrequency regime (SO2+, SO+, K+, S+, Na+, O+ and S++). Power
spectral peaks in the ion cyclotron frequency range from some of the
dayside Ulysses magnetometer data have previously been described. Here
we examine the dayside and high latitude duskside high resolution 1-s
data. Ion cyclotron wave signatures are observed on several occasions
both close to the magnetic equator and at some distance from
it. Rippling and warping of the magnetodisk, as observed by Ulysses,
could be the cause of such ion cyclotron signatures arising some
distance away from the magnetic equator. Lower mass ions are observed
further away from the planet and the heaviest mass ion signatures
apper closer to the Io torus. Preliminary polarisation analysis of the
observations is also presented and some theoretical implications of
the wave signatures are discussed.
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