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See detailMars thermospheric temperatures retrieved from SPICAM dayglow measurements
Stiepen, Arnaud ULg; Gérard, Jean-Claude ULg; Bougher, S et al

Conference (2013, September 10)

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See detailMars ultraviolet dayglow variability: SPICAM observations and comparison with airglow model
Cox, Cédric ULg; Gérard, Jean-Claude ULg; Hubert, Benoît ULg et al

in Journal of Geophysical Research. Planets (2010), 115

Dayglow ultraviolet emissions of the CO Cameron bands and the CO[SUB]2[/SUB][SUP]+[/SUP] doublet in the Martian atmosphere have been observed with the Spectroscopy for Investigation of Characteristics of ... [more ▼]

Dayglow ultraviolet emissions of the CO Cameron bands and the CO[SUB]2[/SUB][SUP]+[/SUP] doublet in the Martian atmosphere have been observed with the Spectroscopy for Investigation of Characteristics of the Atmosphere of Mars on board the Mars Express spacecraft. A large amount of limb profiles has been obtained which makes it possible to analyze variability of the brightness as well as of the altitude of the emission peak. Focusing on one specific season (Ls = [90,180] °), we find that the average CO peak brightness is equal to 118 ± 33 kR, with an average peak altitude of 121.1 ± 6.5 km. Similarly, the CO[SUB]2[/SUB][SUP]+[/SUP] emission shows a mean brightness of 21.6 ± 7.2 kR with a peak located at 119.1 ± 7.0 km. We show that the brightness intensity of the airglows is mainly controlled by the solar zenith angle and by solar activity. Moreover, during Martian summer of year 2005, an increase of the airglow peak altitude has been observed between Ls = 120° and 180°. We demonstrate that this variation is due to a change in the thermospheric local CO[SUB]2[/SUB] density, in agreement with observations performed by stellar occultation. Using a Monte Carlo one-dimensional model, we also show that the main features of the emission profiles can be reproduced for the considered set of data. However, we find it necessary to scale the calculated intensities by a fixed factor. [less ▲]

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See detailThe Mars ultraviolet dayglow variability: SPICAM observations and model comparison
Gérard, Jean-Claude ULg; Cox, Cédric ULg; Bougher, S. W. et al

Conference (2009, September 16)

Limb profiles of the CO Cameron and CO2+ doublet airglow have been observed over different conditions (latitude, season, SZA, F10.7). They have been individually modelled using currently accepted cross ... [more ▼]

Limb profiles of the CO Cameron and CO2+ doublet airglow have been observed over different conditions (latitude, season, SZA, F10.7). They have been individually modelled using currently accepted cross sections, and outputs from the MTGCM. They have been shown to co-vary, with a ICO/ICO2+ ratio of about 4.7, less than the modelled ratio.The peak brightness varies linearly with the F10.7 solar flux proxy, in a way compatible with the Mariner 6 and 7 observations. The intensity of both emissions is overestimated by the model (but large uncertainties exist in excitation cross sections). An increase of the altitude of both emissions has been observed during the 2005 summer season. It is a consequence of the dust load, followed by an increased thermospheric CO2 density observed with SPICAV during the same period. This density enhancement is partly predicted by GCM models. [less ▲]

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See detailLa Marseillaise, ou le devenir d'un chant révolutionnaire en Wallonie.
Raxhon, Philippe ULg

Book published by Institut Jules Destrée (1998)

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See detailMarsick (Familie)
Pirenne, Christophe ULg

in Finscher, Ludwig (Ed.) Die Musik in Geschichte und Gegenwart (2004)

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See detailMarsilio Ficino and Political Syncretism in Ian McEwan's Black Dogs
Delville, Michel ULg

in Notes on Contemporary Literature (1996), XXIV(3), 11-12

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See detailMartí "Taxista"
Dejasse, Erwin ULg

in 9e Art : Les Cahiers du Musée de la Bande Dessinée (2009), 15

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See detailMartial : Livre 7. Édition - traduction - commentaire
Polis, Stéphane ULg

Master's dissertation (2002)

Detailed reference viewed: 91 (10 ULg)
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See detailMartian thermosphere scale height from SPICAM dayglow measurements
Stiepen, Arnaud ULg; Gérard, Jean-Claude; Bougher, Steve et al

Poster (2014)

We analyze the ultraviolet dayglow in the atmosphere of Mars through CO2+ and CO Cameron emissions. These emissions are accumulated on a large dataset of dayside grazing limb performed by the Spectroscopy ... [more ▼]

We analyze the ultraviolet dayglow in the atmosphere of Mars through CO2+ and CO Cameron emissions. These emissions are accumulated on a large dataset of dayside grazing limb performed by the Spectroscopy for Investigation of Characteristics of the Atmosphere of Mars (SPICAM) instrument on board the Mars Express spacecraft. The temperature of the Martian upper atmosphere can be retrieved from these limb emission profiles. We present discussion on the validity domain for such retrieval. We also show evidence for local (spatial and temporal) variability in the scale height of the atmosphere at the altitude of these emissions. [less ▲]

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See detailMartian thermospheric temperatures retrieved from CO2 + SPICAM dayglow measurements
Stiepen, Arnaud ULg; Gérard, Jean-Claude ULg; Bougher, S. et al

Conference (2012, December)

A large dataset of dayside grazing limb CO2+ observations performed by the SPICAM (Spectroscopy for Investigation of Characteristics of the Atmosphere of Mars) instrument on board Mars Express is analyzed ... [more ▼]

A large dataset of dayside grazing limb CO2+ observations performed by the SPICAM (Spectroscopy for Investigation of Characteristics of the Atmosphere of Mars) instrument on board Mars Express is analyzed to retrieve Martian thermospheric temperature, as well as its variation with solar activity, season and latitude. The method permits to retrieve the temperature from the scale height of the CO2+ emission. We also present puzzling features such as limb profiles exhibiting multiple peaks and their characteristics. We furthermore study the behavior of the main emission peak of the CO2+ vertical emission profiles. The CO2+ emission at 289 nm arises from the relaxation of the CO2+* molecule in the B2Σ+ state to the X2Π state. CO2+* molecules are mainly produced in the Martian dayside through photoionisation and photoelectron impact. The CO2+ emission exhibits features that constrain the temperature and density vertical profiles of CO2. Comparisons of retrieved temperatures are made with corresponding simulations from the coupled MGCM-MTGCM. We also use a Monte-Carlo code to model the observed intensity limb profiles. [less ▲]

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See detailMartian thermospheric temperatures retrieved from SPICAM dayglow measurements
Stiepen, Arnaud ULg; Gérard, Jean-Claude ULg; Montmessin, Franck et al

Poster (2013, October)

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See detailMartin Heidegger, Extrait du dernier cours de Marbourg
Pieron, Julien ULg

in Philosophie (in press)

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See detailMartin le bien nommé !
Libois, Roland ULg

Learning material (1994)

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See detailMartin pêcheur d'Europe, Alcedo atthis
Dehem, Christophe; Hallet, Catherine; Libois, Roland ULg

in Jacob, Jean Paul; Dehem, Christophe; Burnel, André (Eds.) et al Atlas des oiseaux nicheurs de Wallonie 2001/ 2007 (2010)

The kingfisher is widespread in Wallonia but is missing locally in middle Belgium and in higher Ardenne. The field prospection for the atlas took place in a favorable climatic context; the current ... [more ▼]

The kingfisher is widespread in Wallonia but is missing locally in middle Belgium and in higher Ardenne. The field prospection for the atlas took place in a favorable climatic context; the current population, estimated at 450 650 pairs, reflects probably the saturation of the habitat. The highest densities are found along large rivers, with important fishing ressources and numerous nesting sites (Lesse, Ourthe, Semois, Viroin). The limiting fator seems to be the lack of nesting sites. [less ▲]

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See detailMartin pêcheur d'Europe, Alcedo atthis
Libois, Roland ULg; Hallet, Catherine

in Rocamora, Gérard; Yeatman Berthelot, Dosithée (Eds.) Oiseaux menacés et à surveiller en France. Liste rouge (1999)

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See detailMartin pêcheur d'Europe, Alcedo atthis
Libois, Roland ULg; Hallet, Catherine

in Yeatman-Berthelot, Dosithée; Jarry, Guy (Eds.) Nouvel atlas des oiseaux nicheurs de France 1985-1989 (1994)

Detailed reference viewed: 14 (3 ULg)
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See detailMartin pêcheur d'Europe, Alcedo atthis
Libois, Roland ULg; Hallet, Catherine

in Yeatman-Berthelot, Dosithée; Jarry, Guy (Eds.) Atlas des oiseaux de France en hiver (1991)

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See detailMartin pêcheur: oiseau de l'année 2005
Libois, Roland ULg

Learning material (2005)

Detailed reference viewed: 14 (2 ULg)