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The atmospheric composition and structure of Jupiter and Saturn from ISO observations: a preliminary review
Lellouch, E.; Feuchtgruber, H.; Atreya, S. K. +4 more
Infrared spectra of Jupiter and Saturn have been recorded with the two spectrometers of the Infrared Space Observatory (ISO) in 1995-1998, in the 2.3-180 µm range. Both the grating modes ( R=150-2000) and the Fabry-Pérot modes ( R=8000-30,000) of the two instruments were used. The main results of these observations are (1) the detection of w…
Silicates in Hale-Bopp: hints from laboratory studies
Brucato, J. R.; Mennella, V.; Colangeli, L. +2 more
The recent passage of the Hale-Bopp (C/1995 O1) comet has provided the first opportunity to analyse the infrared spectral properties of a bright comet both from the ground and by the ISO space observatory. Previous works have already been dedicated to study the potential candidates to reproduce the cometary feature at 10 µm observed for diff…
Lyman-alpha observations of comet 46 P/Wirtanen with swan on SOHO: H2O production rate near 1997 perihelion
Schmidt, W.; Bertaux, J. L.; Lallement, R. +4 more
The SWAN instrument on board SOHO is a Lyman-α photometer able to map the sky intensity with a resolution of 1°, primarily devoted to the study of the large scale distribution of solar wind from its imprints on the interplanetary sky background. In addition SWAN was extensively used to map the Lyman α emission of several comets since launch in Dec…
Three years of Ulysses dust data: 1993-1995
Krüger, H.; Srama, R.; Hamilton, D. P. +18 more
The Ulysses spacecraft is orbiting the Sun on a highly inclined ellipse (i = 79°). After its Jupiter flyby in 1992 at a heliocentric distance of 5.4 AU, the spacecraftreapproached the inner solar system, flew over the Suns south polar region in September 1994,crossed the ecliptic plane at a distance of 1.3 AU in March 1995, and flew over the Suns …
Discrete cloud activity in Saturn's equator during 1995, 1996 and 1997
Rojas, J. F.; Colas, F.; Lecacheux, J. +2 more
A regular extensive CCD imaging of Saturn allowed us to analyze the discrete cloud activity in the Equatorial Zone from 1995 to 1997. The large-scale storm observed in 1994 at +10° ( Sanchez-Lavega et al., 1994, 1996) was rediscovered in 1995, reaching a lifetime >1 year. Its slow motion characterized by a zonal velocity difference of -150 ms <…
The Raman signature of H2 in the uv spectra of Uranus and Neptune: Constraints on the haze optical properties and on the para-H2 fraction
Courtin, Régis
The geometric albedos of Uranus and Neptune, inferred from archived Hubble Space Telescope observations and from the ground-based measurements of Karkoschka, 1994, are modeled in the wavelength range 2200-4200 Å. The radiative transfer model, which includes Rayleigh-Raman scattering and Mie scattering by haze particles, aims at reproducing the fin…
A flux enhancement measured in energetic particles(E ∼ 60-100 keV) by the epona instrument aboard Giotto close to P⧸Grigg-Skjellerup, and its interpretationas the signature of a companion comet
McKenna-Lawlor, Susan M. P.; Afonin, Valerie V.
A significant flux enhancement in energetic particles (E ∼ 60-⩾260 keV),showing internal fine structure interpreted to represent signatures produced during the traversalof various cometary boundaries in P⧸Grigg-Skjellerup, was recorded by the EPONA instrumentaboard spacecraft Giotto on 10 July 1992. A further internally structured flux enhancement…