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Ultraviolet dust aerosol properties as observed by MARCI
Goguen, Jay D.; Wolff, Michael J.; Malin, Michael C. +2 more
Observations by the Mars Color Imager (MARCI) on board the Mars Reconnaissance Orbiter (MRO) in two ultraviolet (UV, Bands 6 and 7; 258 nm, and 320 nm, respectively) and one visible (Band 1, 436 nm) channels of the 2007 planet encircling dust storm are combined with those made by the two Mars Exploration Rovers (MERs) to better characterize the si…
Titan’s vertical aerosol structure at the Huygens landing site: Constraints on particle size, density, charge, and refractive index
Yelle, R. V.; Lavvas, P.; Griffith, C. A.
We present a one dimension simulation of Titan's aerosol distribution and compare our results with the haze optical properties retrieved by the DISR observations (Tomasko, M.G., Doose, L., Engel, S., Dafoe, L.E., West, R., Lemmon, M., Karkoschka, E., See, C. [2008]. Planet. Space Sci. 56, 669-707). We set the mass production of aerosols in the the…
Photometric mapping of Asteroid (4) Vesta’s southern hemisphere with Hubble Space Telescope
Parker, Joel Wm.; Russell, Christopher T.; Thomas, Peter C. +6 more
We present the surface mapping of the southern hemisphere of Asteroid (4) Vesta obtained from Hubble Space Telescope (HST). From 105 images of Vesta through four filters in the wavelengths best to characterize the 1-µm pyroxene band, we constructed albedo and color-ratio maps of Vesta. These new maps cover latitudes -50° to +20°. The souther…
Flow patterns of lobate debris aprons and lineated valley fill north of Ismeniae Fossae, Mars: Evidence for extensive mid-latitude glaciation in the Late Amazonian
Head, James W.; Baker, David M. H.; Marchant, David R.
A variety of Late Amazonian landforms on Mars have been attributed to the dynamics of ice-related processes. Evidence for large-scale, mid-latitude glacial episodes existing within the last 100 million to 1 billion years on Mars has been presented from analyses of lobate debris aprons (LDA) and lineated valley fill (LVF) in the northern and southe…
Mapping the mesospheric CO 2 clouds on Mars: MEx/OMEGA and MEx/HRSC observations and challenges for atmospheric models
Bibring, J. -P.; Gondet, B.; Forget, F. +9 more
This study presents the latest results on the mesospheric CO 2 clouds in the martian atmosphere based on observations by OMEGA and HRSC onboard Mars Express. We have mapped the mesospheric CO 2 clouds during nearly three martian years of OMEGA data yielding a cloud dataset of ∼60 occurrences. The global mapping shows that the…
Martian polar and circum-polar sulfate-bearing deposits: Sublimation tills derived from the North Polar Cap
Le Mouélic, S.; Le Deit, L.; Massé, M. +3 more
Previous spectroscopic studies have shown the presence of hydrated minerals in various kinds of sedimentary accumulations covering and encircling the martian North Polar Cap. More specifically, gypsum, a hydrated calcium sulfate, has been detected on Olympia Planum, a restricted part of the Circum-Polar Dune Field. To further constrain the geograp…
The 3-5 MHz global reflectivity map of Mars by MARSIS/Mars Express: Implications for the current inventory of subsurface H 2O
Pommerol, A.; Plaut, J. J.; Safaeinili, A. +6 more
We extracted the surface echo power from 2 years of MARSIS measurements. The retrieved values are calibrated to compensate for changes in the distance of the spacecraft to the surface and for the attenuation of the signal by the ionosphere. The results are used to build the first global map of surface echo power at 3-5 MHz. The surface echo power …
Seasonal change on Saturn from Cassini/CIRS observations, 2004-2009
Fletcher, Leigh N.; Achterberg, Richard K.; Irwin, Patrick G. J. +7 more
Five years of thermal infrared spectra from the Cassini Composite Infrared Spectrometer (CIRS) are analyzed to determine the response of Saturn's atmosphere to seasonal changes in insolation. Hemispheric mapping sequences at 15.0 cm -1 spectral resolution are used to retrieve the variation in the zonal mean temperatures in the stratosph…
Dione's spectral and geological properties
Baines, Kevin H.; Buratti, Bonnie J.; Clark, Roger N. +12 more
We present a detailed analysis of the variations in spectral properties across the surface of Saturn's satellite Dione using Cassini/VIMS data and their relationships to geological and/or morphological characteristics as seen in the Cassini/ISS images. This analysis focuses on a local region on Dione's anti-saturnian hemisphere that was observed b…
Ion escape from Mars as a function of solar wind conditions: A statistical study
Barabash, Stas; Lundin, Rickard; Nilsson, Hans +5 more
The influence of solar EUV and solar wind conditions on ion escape at Mars is investigated using ion data from the Aspera-3 instrument on Mars Express, combined with solar wind proxy data obtained from the Mars Global Surveyor (MGS) spacecraft. A solar EUV flux proxy based on data from the Earth position, scaled and shifted in time for Mars, is us…