Search Publications
Long-term nadir observations of the O2 dayglow by SPICAM IR
Montmessin, F.; Fedorova, A.; Korablev, O. +4 more
The O2(a1Δg) dayglow at the 1.27 µm band on Mars is produced by the solar UV photolysis of ozone and quenched in collisions with CO2. The SPICAM IR instrument onboard the Mars Express orbiter observes the O2(a1Δg) emission in the Martian atmosphere starting from 200…
Isotopic ratio of nitrogen on Titan: Photochemical interpretation
Krasnopolsky, Vladimir A.
Nitrogen isotope fractionation in predissociation of N2 (Liang et al., 2007) is combined with production of N(4S), N(2D), and N+ in dissociation and dissociative ionization by the solar EUV photons, photoelectrons, magnetospheric electrons and protons, and cosmic rays from the photochemical model. The ca…
The effect of the induced magnetic field on the electron density vertical profile of the Mars' ionosphere: A Mars Express MARSIS radar data analysis and interpretation, a case study
Lester, M.; Ramírez-Nicolás, M.; Sánchez-Cano, B. +3 more
We report the indirect detection of an induced magnetic field in the ionosphere of Mars and its effects on the electron density behaviour. The observations were made by the Mars Advanced Radar for Subsurface and Ionospheric Sounding (MARSIS) aboard Mars Express, in its Active Ionospheric Sounding mode. During several orbits on June 2006, the ionos…
Asteroid orbits with Gaia using random-walk statistical ranging
Muinonen, Karri; Fedorets, Grigori; Pentikäinen, Hanna +10 more
We describe statistical inverse methods for the computation of initial asteroid orbits within the data processing and analysis pipeline of the ESA Gaia space mission. Given small numbers of astrometric observations across short time intervals, we put forward a random-walk ranging method, in which the orbital-element phase space is uniformly sample…
IR heterodyne spectrometer MILAHI for continuous monitoring observatory of Martian and Venusian atmospheres at Mt. Haleakalā, Hawaii
Aoki, Shohei; Kasaba, Yasumasa; Taguchi, Makoto +11 more
A new Mid-Infrared Laser Heterodyne Instrument (MILAHI) with >106 resolving power at 7-12 µm was developed for continuous monitoring of planetary atmospheres by using dedicated ground-based telescopes for planetary science at Mt. Haleakalā, Hawaii. Room-temperature-type quantum cascade lasers (QCLs) that cover wavelength ranges…
Analytical model of Europa's O2 exosphere
Mura, Alessandro; Plainaki, Christina; Milillo, Anna +5 more
The origin of the exosphere of Europa is its water ice surface. The existing exosphere models, assuming either a collisionless environment (simple Monte Carlo techniques) or a kinetic approach (Direct Monte Carlo Method) both predict that the major constituent of the exosphere is molecular oxygen. Specifically, O2 is generated at the su…
The Multi-Temporal Database of Planetary Image Data (MUTED): A database to support the identification of surface changes and short-lived surface processes
Jaumann, R.; Hiesinger, H.; Erkeling, G. +3 more
Images of Mars taken by spacecraft in the last few decades indicate that the landscape has changed and that current processes are continuously changing the surface. The modifications of the landscape are caused by exogenic processes including eolian activity, mass movement, the growth and retreat of the polar caps, glacial processes and crater-for…
A simple model for understanding the DIM dust measurement at comet 67P/Churyumov-Gerasimenko
Flandes, Alberto; Krüger, Harald; Della Corte, Vincenzo +1 more
We present a simple model for gas and dust flow from 67P/Churyumov-Gerasimenko that can be used to understand the grain impact observed by the DIM instrument on Philae (Krüger et al., 2015). We show how model results when applied to the GIADA measurements (Rotundi et al., 2015; Della Corte et al., 2015) can be used, in conjunction with the results…
Origin of the backstreaming ions in a young Hot Flow Anomaly
Vaisberg, O. L.; Shuvalov, S. D.; Shestakov, A. Yu. +1 more
We analyze an event in front of the bow shock observed by Cluster spacecraft on 22.02.2006. This event has many attributes of Hot Flow Anomaly at early stage of development including strong upstream beam and disturbed magnetic profile with increased magnetic field at one or two sides as observed by 4 Cluster spacecraft. The angle between the magne…
Comparison of diffuse infrared and far-ultraviolet emission in the Large Magellanic Cloud: The data
Shalima, P.; Gogoi, Rupjyoti; Saikia, Gautam +1 more
Dust scattering is the main source of diffuse emission in the far-ultraviolet (FUV). For several locations in the Large Magellanic Cloud (LMC), Far Ultraviolet Spectroscopic Explorer (FUSE) satellite has observed diffuse radiation in the FUV with intensities ranging from 1000 to 3×105 photon units and diffuse fraction between 5% and 20%…