Search Publications
Interplanetary Lyman α remote sensing with the Ulysses Interstellar Neutral Gas Experiment
Pryor, Wayne R.; Ajello, Joseph M.; Witte, Manfred
The Ulysses neutral gas instrument obtained celestial sphere maps of interplanetary Lyman α emission from neutral hydrogen in 1991-1996. These maps are unique because the spacecraft was located at a wide range of heliocentric ecliptic latitudes. Eleven of these maps are compared with the predictions of an interstellar wind hydrogen model previousl…
Ulysses observations of a ``density hole'' in the high-speed solar wind
McComas, D. J.; Forsyth, R. J.; Riley, Pete +1 more
Ulysses observations at mid and high heliographic latitudes have revealed a solar wind devoid of the large variations in density, temperature, and speed that are commonly observed at low latitudes. One event, however, observed on May 1, 1996, while Ulysses was located at ~3.7AU and 38.5°, stands out in the plasma data set. The structure, which is …
Magnesium isotopic composition as observed with the CELIAS/MTOF experiment on the SOHO spacecraft
Livi, S.; Hsieh, K. C.; Wurz, P. +27 more
Solar wind abundance ratios of magnesium isotopes measured with the high resolution Mass Time-of-Flight spectrometer (MTOF) of the Charge, Element, and Isotope Analysis System (CELIAS) experiment on board the Solar and Heliospheric Observatory (SOHO) are presented. MTOF, as part of CELIAS, is, because of its high time and mass resolution, an excel…
Radial evolution of ejecta characteristics and transient shocks: Ulysses in-ecliptic observations
Smith, E. J.; Neugebauer, M.; Phillips, J. L. +1 more
During its travel to Jupiter, Ulysses detected 25 ejecta and 32 transient forward shocks (TFS), and in the first 3 months after the Jupiter flyby Ulysses detected 9 ejecta and 5 TFS. Half of these ejecta (17) were associated with TFS. We identified the ejecta using bidirectional streaming of suprathermal electrons accompanied by other plasma cloud…
Shape of the heliospheric termination shock: Effects of latitude variations of solar wind dynamic pressure
Barnes, Aaron
We investigate the consequences of internal solar wind latitude variations on the heliospheric termination shock and the flow of the gas beyond the shock. We have developed a simple gasdynamic model, assuming the solar wind to be a steady, axially symmetric radial outflow of gas that passes through a termination shock and flows incompressibly beyo…
On the differential ion velocity in the inner solar corona and the observed solar wind ionic charge states
Gloeckler, George; Geiss, Johannes; Ko, Yuan-Kuen
Theoretical calculations on multifluid solar wind have indicated that the velocities of ions of the same element are not the same in the inner coronal region where the freeze-in process of these solar wind heavy ions occurs. This may have nonnegligible effect on the inference of the electron temperature in this region from the observed ionic charg…
Impact of the Ulysses velocity on the diagnosis of the electron density by the Unified Radio and Plasma Wave sounder in the outskirts of the Io torus
Canu, Patrick; Cornilleau-Wehrlin, Nicole; Le Sager, Philippe
The resonance spectra collected on February 8, 1992, in the outskirts of the Io plasma torus by the Unified Radio and Plasma wave (URAP) relaxation sounder on board the Ulysses spacecraft present significant differences from the active spectra gathered by earthbound spacecraft in similar plasma conditions. The most striking anomaly is the lack of …
Lower bound for electron core beta in the solar wind
Goldstein, Bruce E.; Gary, S. Peter; Newbury, Jennifer A.
Solar wind electrons, especially under conditions of relatively low speed flow, often can be represented as two bi-Maxwellian components, a cooler, more dense core (denoted by the subscript c) and a hotter, more tenuous halo. Solar wind observations from Ulysses between 1.5 and 2 AU further indicate that the β for electron core temperatures parall…
Latitudinal structure within Jovian hectometric radiation
Higgins, Charles A.; Thieman, James R.; Fung, Shing F. +2 more
Jovian hectometric radio emission (HOM: 300-3000 kHz) has a number of persistent structural features associated with it as observed by the Voyager 1, Voyager 2, Ulysses, and Galileo spacecraft for specific jovigraphic latitudes (-4° to +7.1°) and local times (0.3 to 10.5 hours). Most notable are the presence of HOM emission between 270° and 120° c…
Jovian and terrestrial low-frequency radio bursts: Possible cause of anomalous continuum
Kaiser, M. L.
Observations by the Ulysses Unified Radio and Plasma Wave instrument show that the most intense portion of the Jovian continuum emission appears to emanate from the planet's bow shock or magnetosheath region. This intense component is highly correlated with the Jovian ``type III'' or quasi-periodic (QP-15 and QP-40) bursts. I suggest that this int…