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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…
Magnetic effect due to hypervelocity dust particle impact on the Giotto spacecraft
Neubauer, F. M.; Israelevich, P. L.; Ershkovich, A. I. +1 more
Magnetic field disturbance accompanying dust particle impacts is explained by means of the creation of a secondary cloud around the Giotto spacecraft. The enhancement of the magnetic field is seen as a result of the deceleration of electrons in the cometary plasma flow due to collisions with neutral atoms of the cloud surrounding the spacecraft. A…
Acceleration of interstellar pickup ions in the disturbed solar wind observed on Ulysses
Geiss, J.; Lanzerotti, L. J.; Roelof, E. C. +6 more
Acceleration of interstellar pickup H+ and He+ as well as of solar wind protons and alpha particles has been observed on Ulysses during the passage of a corotating interaction region (CIR) at ~4.5 AU. Injection efficiencies for both the high thermal speed interstellar pickup ions (H+ and He+) and the low…
Ulysses field and plasma observations of magnetic holes in the solar wind and their relation to mirror-mode structures
Goldstein, Bruce E.; Neugebauer, Marcia; Smith, Edward J. +3 more
The term ``magnetic hole'' has been used to denote intervals when the magnitude of the interplanetary magnetic field drops to a few tenths, or less, of its ambient value for a time that corresponds to a linear dimension of tens to a few hundreds of proton gyro-radii. Data obtained by the Ulysses magnetometer and solar wind analyzer have been combi…
The whistler heat flux instability: Threshold conditions in the solar wind
Gary, S. Peter; Scime, Earl E.; Phillips, John L. +1 more
Solar wind electrons are observed often to consist of two components: a core and a halo. The anisotropies and relative average speed of these two components correspond to a heat flux that has the potential to excite several different electromagnetic instabilities; wave-particle scattering by the resulting enhanced fluctuations can limit this heat …