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The enigmatic abundance of atomic hydrogen in Saturn's upper atmosphere
Lotfi Ben-Jaffel, Julie Moses, Robert A. West +5
A planet's Lyman-α (Lyα) emission is sensitive to its thermospheric structure. Here, we report joint Hubble Space Telescope (HST) and Cassini cross-calibration observations of the…
Planet Four: A Neural Network's Search For Polar Spring-time Fans On Mars
Mark D. McDonnell, Eriita Jones, Megan E. Schwamb +3
Dark deposits visible from orbit appear in the Martian south polar region during the springtime. These are thought to form from explosive jets of carbon dioxide gas breaking throug…
Modeling the complete set of Cassini's UVIS occultation observations of Enceladus' plume
Ganna Portyankina, Larry W. Esposito, Klaus-Michael Aye +2
The Cassini Ultraviolet Imaging Spectrograph (UVIS) observed a plume of water vapor spewing out from the south polar regions of Enceladus in occultation geometry 7 times during the…
How Martian araneiforms get their shapes: morphological analysis and diffusion-limited aggregation model for polar surface erosion
Ganna Portyankina, Candice J. Hansen, Klaus-Michael Aye
Araneiforms are radially converging systems of branching troughs exhibiting fractal properties. They are found exclusively in the Southern polar regions of Mars and believed to be…
Planet Four: Probing Springtime Winds on Mars by Mapping the Southern Polar CO Jet Deposits
K. -Michael Aye, Megan E. Schwamb, Ganna Portyankina +11
The springtime sublimation process of Mars' southern seasonal polar CO ice cap features dark fan-shaped deposits appearing on the top of the thawing ice sheet. The fan material…
Planet Four: Terrains - Discovery of Araneiforms Outside of the South Polar Layered Deposits
Megan E. Schwamb, Klaus-Michael Aye, Ganna Portyankina +7
We present the results of a systematic mapping of seasonally sculpted terrains on the South Polar region of Mars with the Planet Four: Terrains (P4T) online citizen science project…