Search Publications
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 …
Volcanic Activity on Io at the Time of the Ulysses Encounter
Spencer, John R.; Howell, Robert R.; Klassen, David R. +2 more
The population of heavy ions in lo's torus is ultimately derived from lo volcanism. Ground-based infrared observations of lo between October 1991 and March 1992, contemporaneous with the 8 February 1992 Ulysses observations of the lo torus, show that volcanic thermal emission was at the low end of the normal range at all lo longitudes during this …
An Overview of Energetic Particle Measurements in the Jovian Magnetosphere with the EPAC Sensor on Ulysses
Krupp, N.; Woch, J.; Keppler, E. +5 more
Observations of ions and electrons of probable Jovian origin upstream of Jupiter were observed after a corotating interplanetary particle event. During the passage of Ulysses through the Jovian bow shock, magnetopause, and outer magnetosphere, the fluxes of energetic particles were surprisingly low. During the passage through the "middle magnetosp…
Imaging Observations of Jupiter's Sodium Magneto-Nebula During the Ulysses Encounter
Mendillo, Michael; Flynn, Brian; Baumgardner, Jeffrey
Jupiter's great sodium nebula represents the largest visible structure traversed by the Ulysses spacecraft during its encounter with the planet in February 1992. Ground-based imaging conducted on Mount Haleakala, Hawaii, revealed a nebula that extended to at least ±300 Jovian radii (spanning ~50 million kilometers); it was somewhat smaller in scal…