References of "Stiepen, Arnaud"
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See detailLa Guerre des Etoiles sous la loupe d'un astrophysicien
Stiepen, Arnaud ULg

Article for general public (2016)

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See detailAux astres, citoyens! Planet Nine
Stiepen, Arnaud ULg

Article for general public (2016)

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See detailDeciphering Mars lower atmosphere: Nitric Oxide nightglow seasonal variations as observed by IUVS
Stiepen, Arnaud ULg

Scientific conference (2016, February 02)

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See detail50 ans d'exploration de la planète Mars
Stiepen, Arnaud ULg

Conference given outside the academic context (2016)

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See detailNotre Système Solaire
Stiepen, Arnaud ULg

Conference given outside the academic context (2016)

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See detailLe Système Solaire
Stiepen, Arnaud ULg

Conference given outside the academic context (2016)

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See detailSPICAM observations and modeling of Mars aurorae
Soret, Lauriane ULg; Gérard, Jean-Claude ULg; Libert, Ludivine ULg et al

in Icarus (2016), 264

Martian aurorae have been detected with the SPICAM instrument on board Mars Express both in the nadir and the limb viewing modes. In this study, we focus on three limb observations to determine both the ... [more ▼]

Martian aurorae have been detected with the SPICAM instrument on board Mars Express both in the nadir and the limb viewing modes. In this study, we focus on three limb observations to determine both the altitudes and the intensities of the auroral emissions. The CO (a3P–X1R) Cameron bands between 190 and 270 nm, the CO Fourth Positive system (CO 4P) between 135 and 170 nm, the CO2+ doublet at 289 nm, the OI at 297.2 nm and the 130.4 nm OI triplet emissions have been identified in the spectra and in the time variations of the signals. The intensities of these auroral emissions have been quantified and the altitude of the strongest emission of the CO Cameron bands has been estimated to be 137 ± 27 km. The locations of these auroral events have also been determined and correspond to the statistical boundary of open-closed magnetic field lines, in cusp-like structures. The observed altitudes of the auroral emissions are reproduced by a Monte-Carlo model of electron transport in the Martian thermosphere for mono-energetic electrons between 40 and 200 eV. No correlation between electron fluxes measured in the upper thermosphere and nadir auroral intensity has been found. Here, we simulate auroral emissions observed both at the limb and at the nadir using electron energy spectra simultaneously measured with the ASPERA-3/ELS instrument. The simulated altitudes are in very good agreement with the observations. We find that predicted vertically integrated intensities for the various auroral emissions are overestimated, probably as a consequence of the inclination and curvature of the magnetic field line threading the aurora. However, the relative brightness of the CO and CO2+ emissions is in good agreement with the observations. [less ▲]

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See detailIndiana Jones sur Mars
Stiepen, Arnaud ULg

Scientific conference (2015, December 17)

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See detailFirst Analysis of Martian Nightglow Seasonal Variations Observed by MAVEN's Imaging Ultraviolet Spectrograph
Stiepen, Arnaud ULg; IUVS team

Poster (2015, December 15)

We report results from a study of nitric oxide nightglow over the northern hemisphere of Mars during winter and southern hemisphere during equinox. We present observations of the nitric oxide δ and γ band ... [more ▼]

We report results from a study of nitric oxide nightglow over the northern hemisphere of Mars during winter and southern hemisphere during equinox. We present observations of the nitric oxide δ and γ band emissions between 190 and 270 nm by the Imaging UltraViolet Spectrograph on the MAVEN spacecraft. The emission reveals recombination of N and O atoms dissociated on the dayside of Mars, and is known to trace upper atmosphere hemispheric circulation patterns. We extend previous studies to higher latitudes, finding brighter emissions closer to the poles as predicted from global circulation models. Statistically significant variability suggests variation of the fluxes of N and O carried from the dayside thermosphere, as well as possible variations of the wind pattern in the nightside thermosphere and mesosphere. [less ▲]

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See detailAn overview of recent IUVS periapse MUV observations
Stiepen, Arnaud ULg

Conference (2015, December 01)

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See detailQue la masse fois accélération soit avec vous !
Stiepen, Arnaud ULg

Article for general public (2015)

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See detailThe Two Types of Aurora on Mars as Observed by MAVEN's Imaging UltraViolet Spectrograph
Schneider; IUVS team; Stiepen, Arnaud ULg

Poster (2015, December)

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See detailProbing the Martian Atmosphere with MAVEN/IUVS Stellar Occultations
Gröller; IUVS team; Stiepen, Arnaud ULg

Poster (2015, December)

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See detailRetrieval of Mars' Upper Atmospheric Composition using Dayglow Observations by IUVS on MAVEN
Evans; IUVS team; Stiepen, Arnaud ULg

Poster (2015, December)

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See detailStudy of the Martian cold oxygen corona from the O I 130.4 nm by IUVS/MAVEN
Chaufray; IUVS team; Stiepen, Arnaud ULg

Poster (2015, December)

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See detailThe Hot Oxygen Corona of Mars: Observations by MAVEN IUVS
Deighan; IUVS team; Stiepen, Arnaud ULg

Poster (2015, December)

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See detailTides in the Martian Atmosphere as Observed by MAVEN IUVS
Lo; IUVS team; Stiepen, Arnaud ULg

Poster (2015, December)

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See detailMAVEN/IUVS Apoapse Observations of the Martian FUV Dayglow
Correira; IUVS team; Stiepen, Arnaud ULg

Poster (2015, December)

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See detailMars Ozone Mapping with MAVEN IUVS
Lefèvre; IUVS team; Stiepen, Arnaud ULg

Poster (2015, December)

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