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Hubble Space Telescope imaging of Jupiter's UV aurora during the Galileo orbiter mission
Gérard, Jean-Claude; Clarke, John T.; Ben Jaffel, Lotfi
Hubble Space Telescope (HST) Wide-Field Planetary Camera 2 (WFPC 2) images of Jupiter's aurora have been obtained close in time with Galileo ultraviolet spectrometer (UVS) spectra and in situ particles, fields, and plasma wave measurements between June 1996 and July 1997, overlapping Galileo orbits G1, G2, G7, G8, and C9. This paper presents HST i…
Heliospheric tomography using interplanetary scintillation observations 2. Latitude and heliocentric distance dependence of solar wind structure at 0.1-1 AU
Jackson, B. V.; Tokumaru, M.; Kojima, M. +4 more
Interplanetary scintillation is a useful means to measure the solar wind in regions inaccessible to in situ observation. However, interplanetary scintillation measurements involve a line-of-sight integration, which relates contributions from all locations along the line of sight to the actual observation. We have developed a computer assisted tomo…
Cross-helicity and residual energy in solar wind turbulence: Radial evolution and latitudinal dependence in the region from 1 to 5 AU
Bavassano, B.; Pietropaolo, E.; Bruno, R.
Solar wind plasma and magnetic field measurements by Ulysses have been used to study magnetohydrodynamic turbulence in different heliospheric regions. Four intervals of six solar rotations have been analyzed. Two of them are on the ecliptic around 2 and 5 AU, respectively, one is at midlatitude near 5 AU, and the last one is at high latitude aroun…
Detailed study of FUV Jovian auroral features with the post-COSTAR HST faint object camera
Prangé, Renée; Rego, Daniel; Pallier, Laurent +3 more
A set of Hubble Space Telescope faint object camera images taken in the H2 bands near 1550 Å is used to infer the morphological properties of the steady state Jovian FUV aurorae. We focus on issues best addressed using the excellent spatial resolution available after correction of the spherical aberration, i.e., those related to high la…
Solar wind radial and latitudinal structure: Electron density and core temperature from Ulysses thermal noise spectroscopy
Moncuquet, Michel; Issautier, Karine; Meyer-Vernet, Nicole +1 more
We present new in situ solar wind plasma measurements obtained during Ulysses fast transit from the south solar pole to the north one, which took place 1 year before the 1996 sunspot minimum. The data were obtained with the radio receiver of the Unified Radio and Plasma Wave Experiment, using the method of quasi-thermal noise spectroscopy, which i…
Overexpanding coronal mass ejections at high heliographic latitudes: Observations and simulations
McComas, D. J.; Riley, Pete; Gosling, J. T. +1 more
Ulysses observations reveal that most coronal mass ejections (CMEs) observed in the solar wind far from the Sun at high heliographic latitudes have large radial widths and are still expanding as they pass the spacecraft. CME radial widths ranging between 0.5 and 2.5 AU have been observed at heliocentric distances between 1.4 and 4.6 AU and at lati…
Characteristics of the Galileo probe entry site from Earth-based remote sensing observations
Baines, Kevin H.; Hora, Joseph; Hinkley, Sasha +14 more
A reassessment of ground-based observations confirms to better than a 98% confidence level that the Galileo probe entered a 5-µm hot spot, a region of unusual clarity and dryness, some 900+/-300km north of its southern boundary. Cloud conditions at that point were similar to those in the center of this region, some 600 km further north. At t…
OH in Saturn's magnetosphere: Observations and implications
Richardson, J. D.; McGrath, M. A.; Eviatar, A. +1 more
The discovery of OH in Saturn's inner magnetosphere changed our view of this region from one where plasma dominated the physics to one where neutrals are dominant. We revisit Hubble Space Telescope observations of OH and derive revised OH brightnesses for observations in 1992, 1994, and 1995. These OH observations as well as Voyager observations a…
Ulysses' rapid crossing of the polar coronal hole boundary
Forsyth, R.; Balogh, A.; McComas, D. J. +2 more
The Ulysses spacecraft crossed from the slow dense solar wind characteristic of the solar streamer belt into the fast, less dense flow from the northern polar coronal hole over a very short interval (several days) in late March 1995. The spacecraft, which was at 1.35 AU and ~19° north heliographic latitude, moving northward in its orbit, remained …
Global model of the corona with heat and momentum addition
Wu, S. T.; Poletto, G.; Suess, S. T. +1 more
We have been developing a series of global coronal models directed at a better simulation of empirical coronal hole and streamer properties. In a previous study, a volumetric heat source was used to produce a thin current sheet above streamers and high solar wind speed in the coronal hole. This improved the preexisting coronal structure for corona…