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Water-Ice Dominated Spectra of Saturn's Rings and Small Moons From JWST
Fletcher, L. N.; Hedman, M. M.; Showalter, M. R. +11 more
JWST measured the infrared spectra of Saturn's rings and several of its small moons (Epimetheus, Pandora, Telesto, and Pallene) as part of Guaranteed Time Observation program 1247. The NIRSpec instrument obtained near-infrared spectra of the small moons between 0.6 and 5.3 microns, which are all dominated by water-ice absorption bands. The shapes …
Unraveling the Tectonic History of the Tharsis Rise on Mars: Plume Migration and Critical Taper Dome
Karagoz, Oguzcan; Kenkmann, Thomas; Hergarten, Stefan
Wrinkle ridges are widespread tectonic landforms that serve as paleo-strain and paleo-stress indicators of the compressional history and thermal evolution of Mars. To reconstruct the center of the Tharsis rise and its migration with time, we mapped wrinkle ridges in the periphery of the dome and analyzed 34,741 wrinkle ridge segments with a total …
Morphological and Structural Characterization of Shortening Landforms on Mars
Klimczak, Christian; McCullough, Leta R.; Crane, Kelsey T. +1 more
The lithosphere of Mars accommodates horizontal shortening through folding and faulting, producing landforms described as wrinkle ridges or lobate scarps. Despite this nomenclature, we lack a deep understanding of the drivers of morphological differences observed between landform types. This study aims to develop a quantitative model for shortenin…
The Venus Global Ionosphere-Thermosphere Model (V-GITM): A Coupled Thermosphere and Ionosphere Formulation
Bougher, Stephen W.; Ridley, Aaron J.; Ponder, Brandon M. +2 more
This paper introduces the new Venus global ionosphere-thermosphere model (V-GITM) which incorporates the terrestrial GITM framework with Venus-specific parameters, ion-neutral chemistry, and radiative processes in order to simulate some of the observable features regarding the temperatures, composition, and dynamical structure of the Venus atmosph…
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…