Search Publications
Vertical and horizontal heterogeneity of atmospheric dust loading in northern Gale Crater, Mars
Lemmon, Mark T.; Newman, Claire E.; Moore, Casey A. +3 more
This paper updates the record of atmospheric dust loading within northern Gale Crater, Mars, by providing line-of-sight extinction (LOS-Ext) measurements of the intervening dust between the rover and the crater rim. These measurements are derived from images taken with the Navigation Cameras (Navcam) onboard the Mars Science Laboratory (MSL) rover…
Improved Chandrayaan-1 M3 data: A northwest portion of the Aristarchus Plateau and contiguous maria
Shkuratov, Yu.; Surkov, Ye.; Ivanov, M. +5 more
We provide and test a method to obtain significant improvement of available Chandrayaan-1 M3 data. The advance is achieved using the Gaussian λ-convolution of spectra and Fourier filtration of images. The main result is imagery of the reflectance across different wavelengths as well as parameters of 1 µm and 2 µm absorption …
Hazes and clouds in a singular triple vortex in Saturn's atmosphere from HST/WFC3 multispectral imaging
Sánchez-Lavega, A.; Pérez-Hoyos, S.; Irwin, Patrick G. J. +2 more
In this paper we present a study of the vertical haze and cloud structure over a triple vortex in Saturn's atmosphere in the planetographic latitude range 55°N-69°N (del Río-Gaztelurrutia et al., 2018) using HST/WFC3 multispectral imaging. The observations were taken during 29-30 June and 1 July 2015 at ten different filters covering spectral rang…
Bright clumps in the D68 ringlet near the end of the Cassini Mission
Hedman, M. M.
The D68 ringlet is the innermost narrow feature in Saturn's rings. Prior to 2014, the brightness of this ringlet did not vary much with longitude, but sometime in 2014 or 2015 a series of bright clumps appeared within D68. These clumps were up to four times brighter than the typical ringlet, occurred within a span of ∼ 120° in corotating longitude…
Formation of Clays, Ferrihydrite, and Possible Salts in Hydrae Chasma, Mars
Weitz, Catherine M.; Bishop, Janice L.
We used multiple orbital data sets to analyze the morphology, composition, and stratigraphy of clays and other hydrated deposits within Hydrae Chasma. Fe/Mg-smectites are concentrated along the lower floor of the chasma, adjacent to pit craters. There are at least two distinct smectites that vary in their morphology and spectral properties, with a…
Maps of Tethys' thermophysical properties
Spencer, J. R.; Howett, C. J. A.; Segura, M. +2 more
On 11th April 2015 Cassini's Composite Infrared Spectrometer (CIRS) made a series of observations of Tethys' daytime anti-Saturn hemisphere over a nine-hour time period. During this time the sub-spacecraft position was remarkably stable (0.3° S to 3.9° S; 153.2° W to 221.8° W), and so these observations provide unprecedented coverage of diurnal te…
Climatology of CH4, HCN and C2H2 in Titan's upper atmosphere from Cassini/VIMS observations
Funke, Bernd; Filacchione, Gianrico; García-Comas, Maya +7 more
The Visual and Infrared Mapping Spectrometer (VIMS) measurements of non-Local Thermodinamic Equilibrium (non-LTE) emissions of CH4, HCN and C2H2 in the near-infrared represent a dataset with unique coverage to study Titan's upper atmosphere in the altitude range from 500 to 1000 km. This region is the key to a bett…
Assessing Martian bedrock mineralogy through "windows" in the dust using near-infrared and thermal infrared remote sensing
Horgan, Briony; Bell, James F., III; Lai, Jason C. +1 more
Much of Mars' surface is mantled by bright dust, which masks the spectral features used to interpret the mineralogy of the underlying bedrock. Despite the wealth of near-infrared (NIR) and thermal infrared (TIR) data returned from orbiting spacecraft in recent decades, the detailed bedrock composition of approximately half of the Martian surface r…
Measurement of plasma channels in the Venus wake
Lundin, R.; Futaana, Y.; Zhang, T. L. +1 more
Plasma channels have been suggested to account for the observation of ionospheric holes in the Venus nightside ionosphere. They are produced by the erosion of the solar wind on the magnetic polar regions of the Venus ionosphere, and are related to a sharp plasma transition that extends along the flanks of the wake and that is located downstream fr…
Automatic endmember bundle unmixing methodology for lunar regional area mineral mapping
Yin, Jihao; Huang, Chenyu; Luo, Xiaoyan +1 more
The mineral distribution on lunar surface can contribute to studying lunar evolution, while abundance quantification is still challenging. Unmixing on spectral reflectance data is an effective way for mineral resource explanation, especially in hardly accessible area. In regional area unmixing, some existing unmixing models mainly rely on spectral…