Search Publications
The Dynamics of CO2-Driven Granular Flows in Gullies on Mars
Iversen, Jens Jacob; Conway, Susan J.; Kleinhans, Maarten G. +10 more
Martian gullies are landforms consisting of an erosional alcove, a channel, and a depositional apron. A significant proportion of Martian gullies at the mid-latitudes is active today. The seasonal sublimation of CO2 ice has been suggested as a driver behind present-day gully activity. However, due to a lack of in situ observations, the …
Investigating the Linkage Between Spiral Trough Morphology and Cloud Coverage on the Martian North Polar Layered Deposits
Palucis, M. C.; Lutz, K. A.; Hawley, R. L.
The martian North Polar layered deposits (NPLD) are composed of alternating water-ice and dust-rich layers resulting from atmospheric deposition and are key to understanding Mars climate cycles. Within these deposits are spiral troughs whose migration affects deposition signals. To understand the relationship between NPLD stratigraphy and Martian …
On the Global Features of the 10-60-Min ULF Waves in Jovian Magnetosphere: Juno Observations
Bonfond, B.; Xu, Y.; Fu, S. Y. +8 more
In the Jovian magnetosphere, quasi-periodic phenomena, with quasi-periods on the order of 10-60 min, are frequently identified using different data sets. These pulsations are a branch of ultra-low frequency (ULF) waves, which are believed to play a crucial role in driving the energy circulation within Jupiter's magnetosphere. In this study, we uti…
EMM EMUS Observations of FUV Aurora on Mars: Dependence on Magnetic Topology, Local Time, and Season
Chaffin, Michael S.; Halekas, Jasper S.; Brain, David A. +14 more
We present a comprehensive study of the nightside aurora phenomenon on Mars, utilizing observations from EMUS onboard Emirates Mars Mission. The oxygen emission at 130.4 nm is by far the brightest FUV auroral emission line observed at Mars. Our statistical analysis reveals geographic, solar zenith angle, local time, and seasonal dependencies of au…
Three-Dimensional Venus Cloud Structure Simulated by a General Circulation Model
Shao, Wencheng D.; Dai, Longkang; Mendonça, João. M.
The clouds have a great impact on Venus's energy budget and climate evolution, but its three-dimensional structure is still not well understood. Here we incorporate a simple Venus cloud physics scheme into a flexible GCM to investigate the three-dimensional cloud spatial variability. Our simulations show good agreement with observations in terms o…
Coarse-Grained Ripples Investigated by the Opportunity Rover on Meridiani Planum, Mars
Kozakiewicz, J.; Dluzewski, M.; Rotnicka, J. +9 more
Aeolian coarse-grained ripples have been found in all regions investigated by Mars rovers: Meridiani Planum, Gusev crater, Gale crater, and Jezero crater. Therefore, it can be assumed that coarse-grained ripples are one of the most common landforms on Mars. Studying their formation and evolution gives us the opportunity to determine past and curre…
Large Glacier-Like Forms on Mars: Insights From Crater Morphologies and Crater Retention Ages
El-Maarry, M. R.; Driver, G.; Hubbard, B. +1 more
Glacier-Like Forms (GLFs) are a subset of ice-rich landforms known as Viscous Flow Features that populate Mars' mid-latitudes. GLFs are morphologically similar to terrestrial valley glaciers and are thought to result from the redistribution of water ice from the Martian poles during periods of high obliquity throughout the Amazonian period. Their …
Geologic History of Deuteronilus Cavus in the Ismenius Lacus Region, Mars
Head, James W.; Hiesinger, Harald; Wueller, Lukas +1 more
The Ismenius Lacus region of Mars has a diverse geological history, and we present the first high-resolution map of Deuteronilus Cavus (36.2°N; 14.0°E, ∼120 km diameter) in the fretted terrain south of the dichotomy boundary. Strong evidence suggests a volcanic origin of the regional plains, based on the ∼50 m thick volcanic bed underlying 180-300…
Effect of Target Layering in Gravity-Dominated Cratering in Nature, Experiments, and Numerical Simulations
Rossi, A. P.; Raducan, S. D.; Collins, G. S. +4 more
Impacts into layered targets may generate "concentric craters" where a wider outer crater in the top layer surrounds a smaller, nested crater in the basement, which itself may be complex or simple. The influence of target on cratering depends on the ratio of target strength to lithostatic stress, which, in turn, is affected by gravity, target dens…
Amazonian Tectonic Evolution of Ceraunius and Tractus Fossae, Mars, and Implications for Local Magmatic Sources
Byrne, Paul K.; Shahrzad, Stephanie; Bramham, Emma K. +2 more
The heavily faulted Martian terrains of Ceraunius Fossae and Tractus Fossae, south of the Alba Mons volcano, have previously only been considered as parts of larger tectonic studies of Alba Mons, and consequently the complexity of the faulting remains unclear. As these terrains are in the midst of the large Tharsis volcanoes, the study of their su…