Search Publications
Low-frequency waves associated with Langmuir waves in solar wind
Stone, R. G.; Thejappa, G.; Wentzel, Donat G.
The Ulysses spacecraft has detected several events of low-frequency electromagnetic waves in association with Langmuir waves in the solar wind. The high time resolution observations show that the Langmuir waves are very intense and occur as broad peaks superposed by collapsing millisecond spikes. The low-frequency waves are identified as electomag…
Impulsive bursts of energetic particles in the high-latitude duskside magnetosphere of Jupiter
Cowley, S. W. H.; Simpson, J. A.; McKibben, R. B. +6 more
Recent studies using the entire set of proton and electron measurements of the cosmic and solar particle investigations (COSPIN) on Ulysses revealed that the impulsive, sometimes quasi-periodic bursts discovered during the Ulysses' pass through Jupiter's duskside magnetosphere consisted not only of relativistic electrons and radio wave emissions b…
Solar wind double ion beams and the heliospheric current sheet
Balogh, A.; Goldstein, B. E.; Phillips, J. L. +2 more
Double ion beams are often observed in the solar wind, but little work has been done in relating these beams to structures within the solar wind. Double ion beams are observed as beams of a given ion species and charge state occurring at two different energies. We use the three-dimensional ion plasma instrument on board the Ulysses spacecraft to l…
Mirroring of fast solar flare electrons on a downstream corotating interaction region
Chaizy, P.; Pick, M.; Anderson, K. A. +5 more
We discuss an example of confinement of fast solar electrons by a discrete solar wind-interplanetary magnetic field structure on February 22, 1991. The structure is about 190,000 km in width and is clearly defined by changes in the direction of the magnetic field at the Ulysses spacecraft. This structure carries electrons moving toward the Sun as …
Coronal electron stream and Langmuir wave detection inside a propagation channel at 4.3 AU
Pick, M.; Forsyth, R. J.; Phillips, J. L. +5 more
Observations of an energetic interplanetary electron event associated with the production of Langmuir waves, both of which are identified at 4.3 AU by instruments on the Ulysses spacecraft, are presented in this paper. This electron event propagates inside a well defined magnetic structure. The existence of this structure is firmly established by …
Solar wind eddies and the heliospheric current sheet
McComas, D. J.; Goldstein, B. E.; Bame, S. J. +1 more
Ulysses has collected data between 1 and 5 AU during, and just following solar maximum, when the heliospheric current sheet (HCS) can be though of as reaching its maximum tilt and being subject to the maximum amount of turbulence in the solar wind. The Ulysses solar wind plasma instrument measures the vector velocity and can be used to estimate th…
Post-Voyager brightness variations on Io
McGrath, Melissa A.; Spencer, John R.; McEwen, Alfred S. +1 more
Imaging of Io with the faint object and planetary cameras of the Hubble space telescope in 1992 and 1993 at wavelengths of ~3450, 3700, and 4100 Å shows two surface areas that have undergone significant, large-scale change in reflectivity since the 1979 Voyager encounters. The first is located in Colchis Regio and covers ~106 km2
Rotational anisotropy of the Jovian magnetosphere at high latitudes
Lanzerotti, L. J.; Maclennan, C. G.; Cheng, A. F. +1 more
The Ulysses spacecraft passed through the Jovian system in February 1992. Its trajectory, determined by its interplanetary mission, directed the spacecraft to the previously unexplored high-latitude regions of the Jovian magnetosphere. Like Pioneers 10 and 11 and the two Voyagers, Ulysses entered the magnetosphere in the near equatorial morning se…
Structure of mass-loading shocks. 2. Comparison of theory and observation at comet Halley
Coates, A. J.; Neubauer, F. M.; Reme, H. +2 more
The multifluid diffusive model of G. P. Zank et al. (1994), which describes the interaction of the solar wind with a cometary plasma in the outer coma, has been used to model the structure of the Halley bow shock. The theoretical results are compared to in situ observations made by Giotto. We compare the solar wind and cometary ion number densitie…
The induced magnetosphere of comet Halley 3. The plasma kinematics
Neubauer, F. M.; Israelevich, P. L.; Ershkovich, A. I.
The plasma velocity in the magnetosphere of comet Halley is calculated by using the displacement of magnetic field lines during the Giotto flyby. The obtained profile is in good agreement with that found from the momentum balance condition. The radial component of plasma velocity measured in situ (Schwenn et al., 1987) correlates well with the spa…