Search Publications
Observable implications of tearing-mode instability in Jupiter's nightside magnetosphere
Zimbardo, G.
We consider the implications on observations of tearing-mode instability in Jupiter's nightside magnetosphere. Theoretical developments of the tearing instability are briefly discussed. Using a self-consistent axisymmetric magnetic field model based on the Voyager data, it is found that magnetic reconnection driven by the internal magnetospheric e…
Electron density and temperature in the Io plasma torus from Ulysses thermal noise measurements
Moncuquet, Michel; Meyer-Vernet, Nicole; Hoang, Sang +2 more
During the Ulysses flyby of Jupiter, the spacecraft crossed the outer part of the Io plasma torus along a basically North-to-South trajectory at a Jovicentric distance of about 8 RJ. The quasi-thermal noise measured by the Unified Radio and Plasma Wave (URAP) experiment is used to deduce the electron density and temperature along the tr…
Ordinary and Z-mode emissions from the Jovian polar region
MacDowall, R. J.; Kaiser, M. L.; Desch, M. D. +2 more
The Ulysses Unified Radio and Plasma (URAP) experiment has detected a new component of Jupiter's radio spectrum in the frequency range from about 10 to 30 kHz. This component is emitted in the magnetoionic ordinary mode from a localized corotating source in the northern polar region. The source is centered at system III longitude 208°, near the me…
Plasma electron signatures of magnetic connection to the Jovian bow shock: Ulysses observations
Balogh, André; Moldwin, Mark B.; Scime, Earl E. +3 more
Ulysses plasma electron observations of bidirectional and enhanced unidirectional electron heat fluxes within 4500 RJ (0.8 a.u. or 3 months on either side of closest approach) of Jupiter are presented as evidence for the magnetic connection of the spacecraft to the Jovian bow shock. These bursts of suprathermal electrons (> 30 eV) ar…
Energetic particle, plasma and magnetic field signatures of a poloidal pulsation in Jupiter's magnetosphere
Dougherty, Michele K.; Balogh, André; Keppler, Erhard +6 more
During its February 1992 inbound journey into Jupiter's magnetosphere, Ulysses made several near-encounters with (and actual traversals of) the Jovian magnetodisk. In at least one such event (investigated here) the anticipated variations in energetic particle fluxes, plasma density, magnetic field intensity, and magnetic field direction at the pla…
Ulysses observations of the planetary depletion layer at Jupiter
Smith, E. J.; Bame, S. J.; Phillips, J. L. +2 more
The repeated samplings of the Jovian magnetosheath during the Ulysses encounter with Jupiter provided an opportunity to probe the planetary depletion layer. Of the 10 complete crossings of the Jovian magnetopause, only three contained clear signatures of an overlying depletion layer. All of these occurred on the flanks of the magnetosphere near th…
Hydrogen from Jupiter's atmosphere in the Jovian magnetosphere
Balsiger, H.; Geiss, J.; Galvin, A. B. +3 more
The passage of Ulysses through Jupiter's magnetosphere presents a new opportunity to investigate the contribution to the Jovian magnetosphere of ions of atmospheric origin. A determination of the magnetospheric H +/He 2+ flux ratio allows an estimate of the relative abundance of ionospheric material in the Jovian magnetospher…
Periodicities of Jovian broad-band kilometric radiation observed by Ulysses
Rabl, G. K. F.
Observations of the Unified Radio and Plasma Wave (URAP) instrument onboard the Ulysses spacecraft have been used to analyze periods inherent in the Jovian broad-banded kilometric radio emission (bKOM) between 29 and 47 kHz. It is demonstrated, by using power spectrum analysis and linear prediction time filtering that the long-term fluctuations of…
Temperatures of Zodiacal dust
Divine, Neil; Grün, Eberhard; Staubach, Peter
Temperatures of interplanetary dust particles have been determined by calculating the termal emission from dust concentrations according to the "Five Populations of Interplanetary Meteroids" model by Divine ( J. geophys. Res., in press, 1993) and matching it with the observed zodiacal thermal emission. Properties of the meteoroid populations are d…
Evidence for accelerated electrons upstream from Jupiter's bow shock: Ulysses results
Chaizy, P.; Anderson, K. A.; Lin, R. P. +1 more
Several transient increases of electrons with energies in the range 40-100 keV have been detected upstream and immediately downstream from the Jovian bow shock (and only in these regions), by instruments on the Ulysses spacecraft during February 1992. The energy spectra of these electrons differ markedly from the energy spectrum of the trapped mag…