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Reduction of Galileo and Ulysses dust data
Hamilton, D. P.; Grün, E.; Kissel, J. +4 more
The reduction procedures which are applied to raw data from the Galileo and Ulysses Dust Detectors are described in order to obtain physical parameters (mass and velocity) for the recorded dust impacts. Both detectors are impact ionization detectors which measure the charge released from an impact onto a solid target. From the rise times of the si…
Two years of Ulysses dust data
Hamilton, D. P.; Grün, E.; Kissel, J. +16 more
From October 18, 1990 to February 8, 1992 the Ulysses spacecraft traversed interplanetary space between the Earth and Jupiter; at Jupiter the spacecraft was deflected below the ecliptic onto a highly-inclined orbit ( i∼80°). Here, we report on dust impact data obtained from launch until the end of 1992, nearly a year after the Jupiter flyby. Durin…
Dust particles beyond the asteroid belt - a study based on recent results of the Ulysses dust experiment
Mann, Ingrid; Grün, Eberhard
Dust fluxes detected by the Ulysses dust experiment beyond the asteroid belt, their possible sources and the possibilities of comparing them to observations of dust in the Zodiacal light are discussed. The dust fluxes detected at solar distances about r < 2.5 AU are compatible with a population of interplanetary dust particles moving on low ecc…
HST observation of the inner coma of 2060 Chiron
Pasian, F.; Fulle, M.; Gil, A. Ortiz
The analysis of persistent comae of very large and distant comets allows us to infer the poorly known physical properties of dust and icy grains produced beyond Jupiter. Chiron is particularly interesting because Fulle ( Astron. Astrophys.282, 980-988; 1994) has shown that the strong asymmetricity of its coma (West, Astron. Astrophys.241, 635-645 …
Observations of minor planets by Hipparcos
Hestroffer, D.; Morando, B.
The main goal of Hipparcos is to build a catalogue of stars but 48 minor planets are bright enough and sufficiently pointlike to be observed also. This paper describes some aspects of the minor planets astrometric data reduction procedure. Comparison to the calculated places is given as well as a first attempt to minor planets orbital elements cor…
Observations of diffuse interstellar bands and of interstellar polarization
Somerville, W. B.
Results are presented from two distinct observational projects, concerning the optical diffuse interstellar bands observed with high-resolution and ultra-high resolution spectroscopy. and UV interstellar polarization observed with the Hubble Space Telescope.
Direction finding study of Jovian hectometric and broadband kilometric radio emissions: evidence for their auroral origin
Zarka, P.; Ladreiter, H. P.; Lacacheux, A.
Taking advantage of the direction finding capabilities of the Ulysses unified radio and plasma wave (URAP) experiment we derive the source locations and emission characteristics of the Jovian hectometric (HOM) and broadband kilometric (bKOM) emissions. Unlike previous studies we additionally determine the systematic error of the source direction d…
Collimation of cometary dust jets and filaments
Keller, H. U.; Knollenberg, J.; Markiewicz, W. J.
It has been suggested that cometary dust jets, as for example imaged by the Halley Multicolour Camera (HMC), possibly originate from vents, or crater-like surface features. Dust flow emitted from such indentations is collimated if compared to emission from a flat surface. Dust liberated from the bottom of a cometary "crater" emerges at the surface…
The morphology of the north Jovian ultraviolet aurora observed with the Hubble Space Telescope
Paresce, Francesco; Prange, Renee; Gerard, Jean-Claude +1 more
A series of six images covering a complete rotation of the north polar region of Jupiter were obtained in February 1993 with the Faint Object Camera on board the Hubble Space Telescope. These images provide the first global picture of the morphology of the Jovian ultraviolet aurora observed from Earth orbit. The camera passband was centered near 1…
Quasiperiodic Jovian Radio bursts: observations from the Ulysses Radio and Plasma Wave Experiment
MacDowall, R. J.; Kaiser, M. L.; Desch, M. D. +3 more
The Ulysses flyby of Jupiter has permitted the detection of a variety of quasiperiodic magnetospheric phenomena. In this paper, Unified Radio and Plasma Wave Experiment (URAP) observations of quasiperiodic radio bursts are presented. There appear to be two preferred periods of short-term variability in the Jovian magnetosphere, as indicated by two…