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Quasiperiodic Jovian Radio bursts: observations from the Ulysses Radio and Plasma Wave Experiment
MacDowall, R. J.; Kaiser, M. L.; Desch, M. D. +3 more
The Ulysses flyby of Jupiter has permitted the detection of a variety of quasiperiodic magnetospheric phenomena. In this paper, Unified Radio and Plasma Wave Experiment (URAP) observations of quasiperiodic radio bursts are presented. There appear to be two preferred periods of short-term variability in the Jovian magnetosphere, as indicated by two…
Impulsive bursts of relativistic electrons discovered during Ulysses' traversal of Jupiter's dusk-side magnetosphere
Simpson, J. A.; McKibben, R. B.; Zhang, M.
During its flyby of Jupiter in February 1992, the Ulysses spacecraft passed through the Southern Hemisphere dusk-side Jovian magnetosphere, a region not previously explored by spacecraft. Among the new findings in this region were numerous, sometimes periodic, bursts of high energy electrons with energies extending from less than 1.5 MeV to beyond…
Measurements of hot plasmas in the magnetosphere of Jupiter
Simnett, G. M.; Pick, M.; Anderson, K. A. +11 more
This paper presents an overview of a number of the principal findings regarding the hot plasmas ( E ≳ 50 keV) in Jupiter's magnetosphere by the HISCALE instrument during the encounter of the Ulysses spacecraft with the planet in February 1992. The hot plasma ion fluxes measured by HI-SCALE in the dayside magnetosphere are similar to those measured…
Ulysses plasma electron observations in the Jovian magnetosphere
McComas, D. J.; Forsyth, R. J.; Bame, S. J. +4 more
The electron analyzer of the solar wind plasma experiment aboard the Ulysses spacecraft measured the plasma properties of the Jovian magnetosphere and surrounding regions during the February 1992 encounter with Jupiter. In addition to sampling a new region of the Jovian magnetosphere, the Ulysses electron measurements were unique in that they incl…
Identification of ``small'' dust impacts in the Ulysses dust detector data
Grün, E.; Linkert, D.; Linkert, G. +2 more
Since October 1990, 3 weeks after the launch of the Ulysses spacecraft, the dust detector onboard recorded impacts of cosmic dust particles. Besides dust impacts, the detector recorded noise from a variety of sources. So far, a very rigid scheme had been applied to eliminate noise from impact data. The data labeled "big" dust impacts previously le…
Field-aligned currents in the Jovian magnetosphere during the Ulysses flyby
Dougherty, M. K.; Balogh, A.; Smith, E. J. +1 more
The data recorded by the dual vector helium/ fluxgate magnetometer flown onboard the Ulysses spacecraft during the flyby of Jupiter in February 1992 are analysed with the aim of identifying the presence of field-aligned current signatures. Field-aligned current flow is expected wherever stress is being transmitted electromagnetically along the mag…
Ulysses observations of noncorotational flows in the outer dayside Jovian magnetosphere
Balogh, A.; Forsyth, R. J.; Cowley, S. W. H. +3 more
Using data from the Anisotropy Telescopes on the Ulysses spacecraft obtained during the February 1992 encounter with Jupiter, we have derived the bulk velocity of ions in the energy range 0.7-1.3 MeV which were detected in Jupiter's outer magnetosphere (at a jovicentric distance of between ∼80 and ∼110 RJ). The derived ion bulk velocity…
Jovian electron jets in interplanetary space
Ferrando, P.; Raviart, A.; Ducros, R. +1 more
The COSPIN/KET experiment onboard Ulysses has been monitoring the flux of ∼ 3-20 MeV electrons in interplanetary space since the launch of Ulysses in October 1990. The origin of these electrons has been known for a long time to be the Jovian magnetosphere. Propagation models assuming interplanetary diffusion of these electrons in the ideal Parker …
Three-dimensional particle anisotropies in and near the plasma sheet of Jupiter observed by the EPAC experiment onboard the Ulysses spacecraft
Krupp, N.; Fränz, M.; Dougherty, M. K. +3 more
During its inbound journey into Jupiter's magnetosphere, Ulysses had several encounters with the Jovian plasma sheet near the magnetic equator, which were related with intensity maxima in the energetic particles. We show for the first time anisotropies in three dimensions of three ion species (protons, helium and oxygen) in the energy range 0.24 &…
Ulysses observations of anti-sunward flow on Jovian polar cap field lines
Dougherty, M. K.; Balogh, A.; Forsyth, R. J. +4 more
We examine the energetic (∼MeV) ion data obtained by the Anisotropy Telescopes instrument of the Ulysses COSPIN package during two northern high-latitude excursions prior to closest approach to Jupiter, when the spacecraft left the region of trapped fluxes on closed magnetic field lines at lower latitudes and entered a region of open field lines w…