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The 2.4- 45 µm spectrum of Mars observed with the infrared space observatory
Lellouch, E.; Encrenaz, T.; de Graauw, T. +6 more
The spectrum of Mars at 2.4- 45 µm has been observed on July 31, 1997 ( Ls=157°) by the short-wavelength spectrometer of the Infrared Space Observatory. The data consist of a high signal to noise, complete grating spectrum (resolving power R∼1500-2500) and portions of the 20- 40 µm spectrum observed in Fabry-Perot mode ( R∼3…
Nitrogen isotope fractionation and its consequence for Titan's atmospheric evolution
Lammer, H.; Owen, T.; Molina-Cuberos, G. J. +2 more
The first determination of the 15N/ 14N ratio in Titan's atmosphere comes from Earth-based millimetric wavelength spectroscopic observations of HC 15N/HC 14N. These measurements indicate that the bulk nitrogen is enriched in the heavy isotope 15N by about 4.5 times relative to the Earth value.…
Laboratory investigation on the formation of unsaturated nitriles in Titan's atmosphere
Kaiser, R. I.; Balucani, N.; Asvany, O. +3 more
Crossed molecular beam experiments of ground state cyano radicals, CN(X 2Σ +), with hydrocarbons acetylene (C 2H 2), ethylene (C 2H 4), methylacetylene (CH 3CCH), allene (H 2CCCH 2), dimethylacetylene (CH 3CCCH 3), and benzene (…
New photochemical model of Saturn's atmosphere
Ollivier, J. L.; Dobrijévic, M.; Parisot, J. P.
A new photochemical model of Saturn's atmosphere, which includes hydrocarbon (up to C 4 compounds) and oxygen compounds, is presented. This model derives from Neptune's model established by Dobrijévic et al. (2000. Planet. Space Sci., submitted). In this one-dimensional model, we consider vertical transport driven by molecular and eddy …
The 90-day oscillations of Jupiter's Great Red Spot revisited
Sánchez-Lavega, A.; Colas, F.; Lecacheux, J. +3 more
We have analyzed a large set of ground-based CCD images covering the period from 1993 to early 1999, to address the current status and behavior of the 90-day longitudinal oscillations of the Jovian Great Red Spot (GRS). The good temporal sampling of these data have been complemented with a small set of high resolution Hubble Space Telescope images…
An analytical model to predict the particle flux on spacecraft in the solar system
Jehn, R.
In this paper an analytical meteoroid flux model is presented which extends from 1 to 10 AU and covers a mass range from 10 -18 to 1 g. The basic flux curve of the model by Grün et al. (1985, Icarus 62, 244-272.) is modified by an analytical multiplication factor in order to approximate the meteoroid flux as predicted by the five-popula…
Wave signatures in the Jovian magnetosphere
Dougherty, Michele; Petkaki, Panagiota
Magnetometer data from the Ulysses Jupiter flyby are examined, in particular middle magnetosphere observations in the vicinity of the magnetodisk. Ion cyclotron waves are searched for in the heavy ion gyrofrequency regime (SO +2, SO +, K +, S +, Na +, O + and S ++