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Origins of the first-order anisotropy of ∼ 1 MeV protons in the Jovian magnetosphere during the Ulysses flyby: flux gradients and plasma flows

Balogh, A.; Forsyth, R. J.; Dunlop, M. W. +4 more

For zeroth-order distributions of energetic ions which are not too far from isotropy, the field-perpendicular first-order anisotropy results principally from the E × B plasma flow transverse to the magnetic field, and from spatial gradients in the ion flux. A technique is presented which separates these sources of anisotropy by examining their dep…

Energetic electron beams in the duskside Jovian magnetosphere: Ulysses EPAC and HI-SCALE measurements

Krupp, N.; Woch, J.; Dougherty, M. K. +4 more

The Ulysses flyby of Jupiter in February 1992 provided the first opportunity to investigate the high southern latitudes of the dusk side magnetosphere. We combine measurements taken by the Ulysses energetic particle instruments EPAC and HI-SCALE and identify bi-directional, field-aligned electron beams in an energy range from 100-380 keV. The beam…

Comet de Vico (122P) and latitude variations of plasma phenomena

Brandt, J. C.; Snow, M.; Yi, Y. +1 more

In situ measurements by the Ulysses spacecraft have unequivocally established differences in solar wind properties at different solar latitudes for 1992 through 1996, and comets are exposed to these different environments depending on latitude. In the polar regions, a less time-varying appearance and a plasma tail orientation corresponding to a hi…

Possible role of electromagnetic low frequency waves in the Io torus in the production of Jovian aurorae

Balogh, A.; Belmont, G.; Forsyth, R. J. +4 more

The possible role of ULF waves observed in the Io torus in the generation of Jovian autorae is investigated. Aaroral emissions have been observed, not only at high latitude, but also at the footprint of magnetic field lines connected to the Io torus in a limited loagitudinal range around 150°. As Ulysses passed by Jupiter, it explored the Io torus…