Search Publications
Relativistic electron flux anisotropies in the duskside Jovian magnetosphere: a test for source location and escape mechanism
Simpson, J. A.; McKibben, R. B.; Zhang, Ming
Results of anisotropy analyses of >∼ 3 MeV electron flux data obtained by the high-energy telescope of the COSPIN experiment on Ulysses are presented for the period from day 40 to day 45 of 1992, when the spacecraft was outbound from Jupiter in the duskside high-latitude magnetosphere and magnetosheath. At small L-shells or minimum magnetic lat…
Observations of electron plasma waves upstream of the Jovian bow shock
Kellogg, P. J.; MacDowall, R. J.; Canu, P. +3 more
The Ulysses spacecraft encountered the planet Jupiter in February 1992, on its journey towards high heliospheric latitude. During the approach to the planet, as well as on the outbound pass, while receding from the Jovian bow shock, the Plasma Frequency Receiver that is part of the Unified Radio and Plasma Wave experiment (URAP) recorded bursts of…
Clock-like behavior of Jovian continuum radiation
Kaiser, M. L.; Desch, M. D.; Farrell, W. M.
Ulysses URAP observations of escaping Jovian continuum radiation show a persistent 10 h variation in amplitude which can best be explained by a clock like model. The continuum shows a moderately strong preference to reach maximum intensity when the 0°-90° System III longitude sector faces the Sun.
Large-amplitude magnetic pulses downstream of the Jovian bow shock: Ulysses observations
Tsurutani, Bruce T.; Smith, Edward J.; Balogh, Andre +2 more
We report the first finding of large-amplitude magnetic pulses in the Jovian magnetosheath. The pulses are highly compressional with Δ| B|/| B| ranging from 0.5 to 2.0. Each pulse contains a full 360° phase rotation. These solitary waves are propagating at an angle nearly orthogonal to the ambient magnetic field ( θkB > 83°). A deter…
Boundary layer ion composition at Jupiter during the inbound pass of the Ulysses flyby
Woch, J.; Galvin, A. B.; Mall, U. +3 more
During the inbound segment of the Ulysses flyby of Jupiter, there were multiple incursions into the dawnside low-latitude boundary layer, as identified by Bame et al. ( Science257, 1539-1542, 1992) using plasma electron data. In the present study, ion composition and spectral measurements provide independent collaborative evidence for the existenc…
Correlations between magnetic field and electron density observations during the inbound Ulysses Jupiter flyby
Dougherty, M. K.; Balogh, A.; Kellogg, P. J. +2 more
The spacecraft Ulysses flew through the Jovian magnetosphere during February 1992. This paper compares the magnetic field observations recorded during the inbound pass of the flyby with the electron density as derived from the URAP instrument. In general, it is expected that the density variations will anti-correlate with the magnetic field streng…
The structure of Jupiter's Io plasma torus inferred from Ulysses radio occultation observations
Pätzold, M.; Bird, M. K.; Asmar, S. W. +3 more
The radio downlinks from Ulysses were monitored during the passage of the spacecraft through the Io plasma torus shortly after closest approach to Jupiter. The electron content of the Io torus was derived from the dispersive phase shift of the S-band (2.3 GHz) signal with respect to the X-band (8.4 GHz) signal. Corrections were applied for non-Jov…
Low-resolution spectra of the Io plasma torus 2 days after the Ulysses encounter
Rauer, H.; Thomas, N.; Jockers, K. +1 more
Low-resolution spectra of the Io plasma torus have been obtained on 10 and 11 February 1992 (2 days after the Ulysses encounter) using the 2 m telescope of the Bulgarian National Observatory. The spectra show the forbidden line emissions of S + (λλ 6716, 6731 Å) and S 2+ (λ 6312 Å). Measured intensities are compared with a Vo…
Langmuir wave decay and collapse in the Jovian foreshock
Kellogg, Paul J.; Thiessen, Jerold P.
Langmuir waves are known to be created upstream of planetary bow shocks by the two-stream instability driven by sunward-streaming particles. In this paper we examine Langmuir waves detected by Ulysses' Unified Radio and Plasma wave experiment (URAP) upstream of Jupiter. Wave envelopes qualitatively consistent with collapsed Langmuir waves are comm…
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…