Search Publications
Energetic electron beams in the duskside Jovian magnetosphere: Ulysses EPAC and HI-SCALE measurements
Krupp, N.; Woch, J.; Dougherty, M. K. +4 more
The Ulysses flyby of Jupiter in February 1992 provided the first opportunity to investigate the high southern latitudes of the dusk side magnetosphere. We combine measurements taken by the Ulysses energetic particle instruments EPAC and HI-SCALE and identify bi-directional, field-aligned electron beams in an energy range from 100-380 keV. The beam…
Comet de Vico (122P) and latitude variations of plasma phenomena
Brandt, J. C.; Snow, M.; Yi, Y. +1 more
In situ measurements by the Ulysses spacecraft have unequivocally established differences in solar wind properties at different solar latitudes for 1992 through 1996, and comets are exposed to these different environments depending on latitude. In the polar regions, a less time-varying appearance and a plasma tail orientation corresponding to a hi…
Possible role of electromagnetic low frequency waves in the Io torus in the production of Jovian aurorae
Balogh, A.; Belmont, G.; Forsyth, R. J. +4 more
The possible role of ULF waves observed in the Io torus in the generation of Jovian autorae is investigated. Aaroral emissions have been observed, not only at high latitude, but also at the footprint of magnetic field lines connected to the Io torus in a limited loagitudinal range around 150°. As Ulysses passed by Jupiter, it explored the Io torus…
Observation of interplanetary particles in a corotating interaction region and of energetic water group ions from comet Grigg-Skjellerup
Coates, A. J.; Neubauer, F. M.; Daly, P. W. +2 more
During the flyby of the Giotto S/C with comet Grigg-Skjellerup (G-S) (9-11 July 1992) energetic particles ( EH 2O > 60 keV, Ep > 30 keV, Eα > 3.5 MeV), magnetic fields and plasma ions were measured by three different detectors on board Giotto. The flyby period was characterized by high magnetic field …
Magnetic mapping of auroral signatures of comet SL9 in the Jovian magnetosphere
Dunlop, M.; Prangé, R.; Maurice, S. +2 more
The electrodynamic interaction of comet Shoemaker-Levy 9 (SL9) with the Jovian magnetosphere gave rise to the detection of several unique phenomena in the UV, X-ray and radio wavelength ranges. Among them, the detection of an unusual FUV bright spot in Hubble Space Telescope images of the southern polar cap on July 20, just before P2 collision, ma…
An overview of the anisotropy telescope observations of MeV ions during the Ulysses Jupiter encounter
Balogh, A.; Forsyth, R. J.; Cowley, S. W. H. +4 more
Observations of ∼ MeV ions obtained in Jupiter's magnetosphere with the COSPIN Anisotropy Telescope experiment during Ulysses' encounter with Jupiter in February 1992 are presented. Ulysses is the fifth spacecraft to have visited Jupiter's magnetosphere, all of which approached Jupiter from the mid-morning sector close to the equatorial plane. Uly…
The charge state of helium in the Jovian magnetosphere: a possible method to determine it
Krupp, N.; Keppler, E.
Ion measurements from the EPAC instrument on board the Ulysses spacecraft inside the Jovian dayside magnetosphere in February 1992 are reported. Energy/charge ( E/q) spectra for protons (0.5-1.0 MeV) and different ions (helium, oxygen and sulphur) in the energy range 0.4-9.0 MeV N -1 are concentrated on. In agreement with the earlier wo…
Energetic ion and electron observations at Jupiter's dayside magnetopause: implications for magnetopause location and boundary coupling processes
Balogh, A.; Forsyth, R. J.; Cowley, S. W. H. +7 more
An analysis is presented of the fluxes and anisotropies of energetic (MeV) ions and electrons measured by instruments of the COSPIN package during the first inbound traversal of the Jovian dayside magnetospheric boundary region by the Ulysses spacecraft in February 1992. The aim of the study is to elucidate the nature of the multiple structures ob…
Comparison of the wave energy transport at comets p/Halley and p/Giacobini-Zinner
Tsurutani, B. T.; Glassmeier, K. -H.; Neubauer, F. M. +2 more
Using magnetic field, plasma density and flow observations from spacecraft flybys of two comets, Elsässer variables are determined in order to study wave propagation directions. The inbound path of the Giotto spacecraft flyby of comet p/Halley is investigated outside the bow shock (between 10:36 and 19:11 UT on March 13, 1986, corresponding to dis…
Numerical simulations of non-adiabatic particle motions in the Jovian magnetosphere; comparisons with Ulysses observations
Keppler, E.; Korth, A.; Quenby, J. J. +3 more
The Ulysses encounter with Jupiter gave a unique opportunity for the study of ions in the Jovian day side in the range 0.3 < ( E/nuc) < 6 MeV. The EPAC experiment has already provided a wealth of interesting results concerning the composition and the anisotropies in the magnetosphere (Krupp et al., Planet. Space Sci.41, 953, 1993), however a…