References of "Stiepen, Arnaud"
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See detailIUVS observations of Nitric Oxide nightglow
Stiepen, Arnaud ULg; The IUVS team

Conference (2015, September)

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See detailTwinkling Lights in the Nightside Upper Atmosphere: How Nightglow Contributes to our Understanding of Global Dynamics
Brecht, Amanda; Bougher, S.; Stiepen, Arnaud ULg et al

Conference (2015, September)

Upper atmospheres of planets continuously emit photons in the UV, Visible, and IR regions of the electromagnetic spectrum. Some of these emissions are classified as airglow, which includes dayglow and ... [more ▼]

Upper atmospheres of planets continuously emit photons in the UV, Visible, and IR regions of the electromagnetic spectrum. Some of these emissions are classified as airglow, which includes dayglow and nightglow. There are several mechanisms to create these emissions, but this presentation will focus on nightglow emissions resulting from photochemistry of neutral components. These neutral components originate on the dayside and are transported from the dayside to the nightside of a planet, where they subsequently undergo chemical reactions yielding nightglow. Nightglow emissions serve as effective tracers for planetary middle and upper atmosphere global wind systems due to their variable peak brightness and spatial distributions. The main planetary focus for this presentation will be on Mars and Venus’ atmospheres, due to the similar chemical constituents which populate their upper atmospheres. Currently, NO UV nightglow has been observed (e.g. Venus Express, Mars Express) on both Venus and Mars, while O2 IR nightglow has only been observed on Venus but is predicted to be seen on Mars. The observations show variations in time and location (latitude, local time, and altitude). The locations of the maximum nightglow intensities on each planet are different, but are supportive of the general picture of these two planet’s global circulation patterns. Model implications for both nightglows on both planets can provide valuable insight and understanding of the dynamical and chemical processes creating the nightglow emission variability. Two three-dimensional general circulation models will be utilized: the Venus Thermospheric General Circulation Model (VTGCM) and the Mars Global Ionosphere-Thermosphere Model (MGITM). The model output will be compared to nightglow datasets for each planet individually and planet to planet, to contrast the variations of the nightglow features and the underlying drivers for those variations. [less ▲]

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See detailFirst Results From MAVEN’s Imaging UV Spectrograph
Schneider; McClintock; Stewart et al

Conference (2015, September)

We report the first results from The Imaging Ultraviolet Spectrograph (IUVS) aboard the Mars Atmosphere and Volatile and EvolutioN (MAVEN) spacecraft orbiting Mars. The instrument is accomplishing its ... [more ▼]

We report the first results from The Imaging Ultraviolet Spectrograph (IUVS) aboard the Mars Atmosphere and Volatile and EvolutioN (MAVEN) spacecraft orbiting Mars. The instrument is accomplishing its goals of characterizing the atmospheric composition and structure, enabling studies of atmospheric escape that will contribute to our understanding of Mars’ atmospheric evolution. In addition, the instrument has made unexpected discoveries concerning meteor showers, aurora and nightglow on Mars. [less ▲]

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See detailDiscovery of Diffure Aurora on Mars
Stiepen, Arnaud ULg; Schneider; Jain et al

Conference (2015, September)

The Imaging Ultraviolet Spectrograph (IUVS, McClintock et al., 2014) onboard the MAVEN spacecraft has discovered diffuse aurora in Mars’ northern hemisphere spanning a wide range of geographic latitudes ... [more ▼]

The Imaging Ultraviolet Spectrograph (IUVS, McClintock et al., 2014) onboard the MAVEN spacecraft has discovered diffuse aurora in Mars’ northern hemisphere spanning a wide range of geographic latitudes and longitudes (Figure 1). This widespread aurora differs from the small auroral patches discovered by the SPICAM instrument onboard the Mars Express spacecraft (Bertaux et al., 2005; Leblanc et al., 2008; Gérard et al., submitted; Soret et al., submitted) restricted to regions of crustal magnetic fields in the southern hemisphere. Furthermore, the northern diffuse aurora appears to peak at altitudes below 100 km, while the crustal field aurora peaked around 120 km. [less ▲]

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See detailDynamique et structure de la haute atmosphère de Mars
Stiepen, Arnaud ULg

Book published by Edition Européenne Universitaire (2015)

La haute atmosphère de Mars est une région clé pour notre compréhension de son évolution. Par analogie, l'étude de Mars permettra de mieux cerner les grands changements climatiques terrestres. Depuis 2003 ... [more ▼]

La haute atmosphère de Mars est une région clé pour notre compréhension de son évolution. Par analogie, l'étude de Mars permettra de mieux cerner les grands changements climatiques terrestres. Depuis 2003, la sonde Mars Express de l'ESA observe la thermosphère de Mars par le biais des traceurs de sa composition, structure et dynamique que sont les luminescences atmosphériques. Cette étude se concentre sur l'observation ultraviolette de la haute atmosphère de Mars et propose des résultats inédits concernant ses propriétés. Cet ouvrage lance aussi des pistes pour de futures observations grâce à la sonde MAVEN de la NASA. [less ▲]

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See detailIUVS periapse observations of Mars’ Nitric Oxide
Stiepen, Arnaud ULg; IUVS team

Scientific conference (2015, June 24)

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See detailPourquoi se mobiliser pour la planète rouge?
Stiepen, Arnaud ULg

Conference given outside the academic context (2015)

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See detailMAVEN IUVS observations of the aftermath of the Comet Siding Spring meteor shower on Mars
Schneider, Nick; Deighan, Justin; Stewart, Ian et al

in Geophysical Research Letters (2015)

We report the detection of intense emission from magnesium and iron in Mars' atmosphere caused by a meteor shower following Comet Siding Spring's close encounter with Mars. The observations were made with ... [more ▼]

We report the detection of intense emission from magnesium and iron in Mars' atmosphere caused by a meteor shower following Comet Siding Spring's close encounter with Mars. The observations were made with the Imaging Ultraviolet Spectrograph, a remote sensing instrument on the Mars Atmosphere and Volatile EvolutioN spacecraft orbiting Mars. Ionized magnesium caused the brightest emission from the planet's atmosphere for many hours, resulting from resonant scattering of solar ultraviolet light. Modeling suggests a substantial fluence of low-density dust particles 1–100 µm in size, with the large amount and small size contrary to predictions. The event created a temporary planet-wide ionospheric layer below Mars' main dayside ionosphere. The dramatic meteor shower response at Mars is starkly different from the case at Earth, where a steady state metal layer is always observable but perturbations caused by even the strongest meteor showers are challenging to detect. [less ▲]

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See detailMAVEN's Imaging Spectrograph and the Legacy of Charles Barth
Schneider, Nick; McClintock, W; Stewart, I et al

Scientific conference (2015, May 15)

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See detailEarly results from the MAVEN mission and the Imaging UltraViolet Spectrograph
Schneider; Stiepen, Arnaud ULg; et al

Scientific conference (2015, March 30)

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See detailThe Solar Energetic Particle experiment on MAVEN: first results
Larson, Davin; Lillis; Dunn et al

Conference (2015, March)

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See detailAnalysis of Martian nightglow and aurora
Stiepen, Arnaud ULg

Conference (2015, March)

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See detailIUVS dayglow analysis
Jain; Evans; Stevens et al

Conference (2015, March)

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See detailPreliminary analysis of Martian dayglow observed by the Imaging Ultraviolet Spectrograph onboard MAVEN
Jain, Sonal; Stewart, Ian; Schneider, Nick et al

Conference (2015, March)

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See detailMAVEN IUVS observations of the aftermath of Comet Siding Spring's meteor shower
Stewart; Schneider; Plane et al

Conference (2015, March)

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See detailFirst results from MAVEN's Imaging UV spectrograph
Schneider; McClintock; Stewart et al

Conference (2015, March)

Detailed reference viewed: 11 (0 ULg)
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See detailPreliminary analysis of Martian nightglow and aurora observed by MAVEN's Imaging UltraViolet Spectrograph
Stiepen, Arnaud ULg; Stewart; Jain et al

Conference (2015, March)

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See detailUltraviolet observations of the atmospheres of Venus and Mars and implications for their dynamics
Stiepen, Arnaud ULg

Scientific conference (2015, February 15)

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Peer Reviewed
See detailTen years of Martian nitric oxide nightglow observations
Stiepen, Arnaud ULg; Gérard, Jean-Claude ULg; Gagné, Marie-Eve et al

in Geophysical Research Letters (2015)

Detailed reference viewed: 20 (4 ULg)