Search Publications
Magnetic Field Observations During the Ulysses Flyby of Jupiter
Dougherty, M. K.; Balogh, A.; Tsurutani, B. T. +5 more
The Jovian flyby of the Ulysses spacecraft presented the opportunity to confirm and complement the findings of the four previous missions that investigated the structure and dynamics of the Jovian magnetosphere and magnetic field, as well as to explore for the first time the high-latitude dusk side of the magnetosphere and its boundary regions. In…
Ulysses Radio and Plasma Wave Observations in the Jupiter Environment
Goetz, K.; Kellogg, P. J.; MacDowall, R. J. +23 more
The Unified Radio and Plasma Wave (URAP) experiment has produced new observations of the Jupiter environment, owing to the unique capabilities of the instrument and the traversal of high Jovian latitudes. Broad-band continuum radio emission from Jupiter and in situ plasma waves have proved valuable in delineating the magnetospheric boundaries. Sim…
Jupiter's Magnetosphere: Plasma Description from the Ulysses Flyby
Goldstein, Bruce E.; Neugebauer, Marcia; Thomsen, Michelle F. +7 more
Plasma observations at Jupiter show that the outer regions of the Jovian magnetosphere are remarkably similar to those of Earth. Bow-shock precursor electrons and ions were detected in the upstream solar wind, as at Earth. Plasma changes across the bow shock and properties of the magnetosheath electrons were much like those at Earth, indicating th…
Energetic Charged-Particle Phenomena in the Jovian Magnetosphere: First Results from the Ulysses COSPIN Collaboration
Balogh, A.; Kunow, H.; Muller-Mellin, R. +16 more
The Ulysses spacecraft made the first exploration of the region of Jupiter's magnetosphere at high Jovigraphic latitudes (~37^circ south) on the dusk side and reached higher magnetic latitudes (~49^circ north) on the day side than any previous mission to Jupiter. The cosmic and solar particle investigations (COSPIN) instrumentation achieved a rema…
The Hot Plasma Environment at Jupiter: Ulysses Results
Simnett, G. M.; Pick, M.; Anderson, K. A. +10 more
Measurements of the hot plasma environment during the Ulysses flyby of Jupiter have revealed several new discoveries related to this large rotating astrophysical system. The Jovian magnetosphere was found by Ulysses to be very extended, with the day-side magnetopause located at ~105 Jupiter radii. The heavy ion (sulfur, oxygen, and sodium) populat…
Plasma Composition in Jupiter's Magnetosphere: Initial Results from the Solar Wind Ion Composition Spectrometer
Livi, S.; Balsiger, H.; Geiss, J. +10 more
The ion composition in the Jovian environment was investigated with the Solar Wind Ion Composition Spectrometer on board Ulysses. A hot tenuous plasma was observed throughout the outer and middle magnetosphere. In some regions two thermally different components were identified. Oxygen and sulfur ions with several different charge states, from the …
Ulysses at Jupiter: An Overview of the Encounter
Smith, E. J.; Wenzel, K. -P.; Page, D. E.
In February 1992, the Ulysses spacecraft flew through the giant magnetosphere of Jupiter. The primary objective of the encounter was to use the gravity field of Jupiter to redirect the spacecraft to the sun's polar regions, which will now be traversed in 1994 and 1995. However, the Ulysses scientific investigations were well suited to observations…
Hubble Space Telescope Imaging of the North Polar Aurora on Jupiter
Caldwell, J.; Hua, X. -M.; Turgeon, B.
The first direct images of the Jovian aurora at ultraviolet wavelengths were obtained by the Hubble Space Telescope Faint Object Camera near the time of the Ulysses spacecraft encounter with Jupiter on 8 February 1992. The auroral oval is not uniformly luminous. It exhibits a brightness minimum in the vicinity of longitude 180^circ. In the few ima…
Ulysses Dust Measurements Near Jupiter
Morfill, Gregor E.; Kissel, Jochen; Schwehm, Gerhard +13 more
Submicrometer- to micrometer-sized particles were recorded by the Ulysses dust detector within 40 days of the Jupiter flyby. Nine impacts were recorded within 50 Jupiter radii with most of them recorded after closest approach. Three of these impacts are consistent with particles on prograde orbits around Jupiter and the rest are believed to have r…
Ulysses Radio Occultation Observations of the Io Plasma Torus During the Jupiter Encounter
Bird, M. K.; Asmar, S. W.; Volland, H. +4 more
Radio signals from Ulysses were used to probe the lo plasma torus (IPT) shortly after the spacecraft's closest approach to Jupiter. The frequencies of the two downlinks at S-band (2.3 gigahertz) and X-band (8.4 gigahertz) were recorded, differenced, and integrated in order to derive the columnar electron density of the IPT. The measurements agree …