Search Publications
Multiple sites of recent wet-based glaciation identified from eskers in western Tempe Terra, Mars
Fawdon, Peter; Davis, Joel M.; Woodley, Savana Z. +4 more
Precipitation in Mars' mid-latitudes formed Viscous Flow Features (VFFs), landforms analogous to terrestrial debris-covered glaciers, in the last 1 Gyr. Until recently, the prevailing view was that the Amazonian environment was not conducive to basal melting of VFFs. However, recent identification of VFF-linked eskers (sedimentary ridges deposited…
Statistical study of lightning-generated whistler-mode waves observed by Venus Express
Zhang, Tielong; Russell, Christopher T.; Hart, Richard A.
From 2006 through 2014, Venus Express regularly observed lightning-generated whistler-mode waves in the ionosphere of Venus. Since the ionopause of Venus is relatively low on the dayside, we restrict our statistical results to below 400 km altitude. Although the detections were of comparable rates for solar minimum and solar maximum (5.4% and 5.0%…
Chronological and compositional mapping of the Mare Orientale basin using Chandrayaan-1 - M3 and LRO datasets
Karthi, A.; Arivazhagan, S.
The lunar multiring mare basins have different ages, compositions and are associated with the diverse unit of mare deposits, providing evidence for the origin and evolution of the lunar crust. The multiring basins offer the opportunity to assess many unknown questions that may reveal the lunar geologic standpoint. The Mare Orientale basin is one o…
Optical observations and dust modelling of comet 156P/Russell-LINEAR
Aravind, K.; Halder, Prithish; Ganesh, Shashikiran +5 more
Comet 156P/Russell-LINEAR is a short period Jupiter family comet with an orbital period of 6.44 years. The results from spectroscopic, photometric, polarimetric observations and dust modelling studies are presented here. From the spectroscopic study, strong emissions from CN(Δν = 0) , C3 (λ 4050 Å), C2(Δν = + 1) and C2
Insight into martian crater degradation history based on crater depth and diameter statistics
Pan, Lu; Quantin-Nataf, Cathy; Mandon, Lucia +2 more
Impact craters are widely used to investigate the geologic history of planetary surfaces. Their morphology bears clues on past surface processes that affected it such as erosion, sedimentary deposit and volcanic processes and their density is widely used to date planetary surfaces.
In this study we propose to combine crater Density and morpho…An arid-semiarid climate during the Noachian-Hesperian transition in the Huygens region, Mars: Evidence from morphological studies of valley networks
Xiao, Long; Zhao, Jiannan; Yang, Yong +2 more
Fluvial activities play important roles in the geologic evolution of early Mars. As one of the most ancient fluvial features on Mars, the widely distributed valley networks (VNs) provide clues for understanding the early martian climate. Our study focuses on the morphological and hydrological features of VNs around the Huygens basin in the ancient…
Flow patterns of Jupiter's south polar region
Hansen, C. J.; Bolton, S.; Peach, D. +11 more
Previous studies of Jupiter's wind patterns revealed the southernmost two prograde jets at 58°S and 64°S (planetocentric), which we designate as the S5 and S6 jets, respectively, but the jets and the wind patterns further poleward were not well defined. The Juno mission has provided the first opportunity to study the South Polar Region (SPR). Here…
Analysis of the long-term drift rates and oscillations of Jupiter's largest vortices
Simon, Amy A.; Morales-Juberías, Raúl; Cosentino, Richard G.
Jupiter's troposphere is dynamically characterized by a series of alternating eastward and westward jets. Embedded between these alternating jets, large vortices, characterized by their high speed closed circulations can be found in several latitudinal bands. The Great Red Spot (GRS) and the White Ovals (WOS) located at ≈ 22 and ≈ 30 degrees south…
Martian atmospheric water vapor abundances in MY26-30 from Mars Express PFS/LW observations
Pankine, Alexey A.
I report on retrievals of water vapor abundances in the Martian atmosphere using observations by Planetary Fourier Spectrometer Long Wavelength channel (PFS/LW) aboard the Mars Express (MEx) spacecraft. PFS/LW observations used in this work cover almost 4 Martian Years from Ls ~ 331° in MY26 (January 2004) to Ls ~ 209° in MY3…
Evolution of a dark vortex on Neptune with transient secondary features
de Pater, Imke; Wong, Michael H.; Irwin, Patrick G. J. +8 more
Dark spots on Neptune observed by Voyager and the Hubble Space Telescope are thought to be anticyclones with lifetimes of a few years, in contrast with very long-lived anticyclones in Jupiter and Saturn. The full life cycle of any Neptune dark spot has not been captured due to limited temporal coverage, but our Hubble observations of a recent feat…