Search Publications
Origins of the first-order anisotropy of ∼ 1 MeV protons in the Jovian magnetosphere during the Ulysses flyby: flux gradients and plasma flows
Balogh, A.; Forsyth, R. J.; Dunlop, M. W. +4 more
For zeroth-order distributions of energetic ions which are not too far from isotropy, the field-perpendicular first-order anisotropy results principally from the E × B plasma flow transverse to the magnetic field, and from spatial gradients in the ion flux. A technique is presented which separates these sources of anisotropy by examining their dep…
Physical risks of landing on a cometary nucleus
Kührt, E.; Keller, H. U.; Knollenberg, J.
Comets originate from the outer solar system where the density and temperature of the planetary nebula were rather low. They form a distinct class of small solar system bodies and their physical properties differ considerably from those of any other known objects. The present knowledge of the cometary nucleus is cursory and driven more by imaginat…
Using photochemistry to explain the formation and observation of C 2 in comets
Weaver, Harold A.; A'Hearn, Michael F.; Sorkhabi, Osman +4 more
Laboratory data taken from the laser-induced fluorescence (LIF) spectrum of C 2(X 1Σg+) radicals produced during the 193 nm laser photolysis of C 2H 2 has been used to explain the band profiles of the Hubble Space Telescope (HST) on nucleus spectra of the C 2 Mulliken sys…
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…