A5033877545- Planetary Science and Exploration
- Astro and Planetary Science
- Space Exploration and Technology
- Aeolian processes and effects
- Space Science and Extraterrestrial Life
- Geology and Paleoclimatology Research
- Spaceflight effects on biology
- Lightning and Electromagnetic Phenomena
- Image Processing and 3D Reconstruction
- Atmospheric aerosols and clouds
- Maritime and Coastal Archaeology
- Biocrusts and Microbial Ecology
- Landslides and related hazards
- Scientific Research and Discoveries
- Ionosphere and magnetosphere dynamics
- Textile materials and evaluations
- Material Science and Thermodynamics
- Radiative Heat Transfer Studies
- Gas Dynamics and Kinetic Theory
- Heat Transfer and Optimization
- Isotope Analysis in Ecology
- Power Line Communications and Noise
- Plant Surface Properties and Treatments
- Marine and environmental studies
- Remote Sensing in Agriculture
Stanford University
2020-2024
Technion – Israel Institute of Technology
2023-2024
Planetary Science Institute
2017-2023
University of California, Los Angeles
2018-2021
Weizmann Institute of Science
2015-2017
Reichman University
2015
Tel Aviv University
2013
Sand mobilized by wind forms decimeter-scale impact ripples and decameter-scale or larger dunes on Earth Mars. In addition to those two bedform scales, orbital in situ images revealed a third distinct class of meter-scale Since their discovery, main hypotheses have been proposed explain the formation large martian ripples-that they originate from growth wavelength height that arise same hydrodynamic instability as windblown subaqueous bedforms instead. Here we provide evidence form ripples....
The morphological analysis of aeolian dunes from satellite and spacecraft imagery has traditionally relied on human expert interpreters. This approach been often impeded by the need for manual input, which limits breadth scope, could be sensitive to bias [1-3]. In recent years, machine learning techniques have revolutionized automatic images, particularly purpose object detection [4, 5] – but require optimization (“training”) large manually labeled datasets....
The morphology of isolated barchan dunes on Mars and Earth may shed light the dynamic conditions that form them, their migration direction physical properties sediments composing them. Thusfar, dune fields have been largely manually analyzed from aerial satellite imagery, as automatic detection techniques are often not sufficiently accurate in outlining dunes. Here, we employ an instance segmentation neural network to detect outline Earth. We train test model martian targets using...
Abstract Evidence in radar, reflectance, and visible imagery indicates that surface subsurface water ice is present inside permanently shadowed regions the north polar region of Mercury. The origin this time at which it was delivered to planet are both unknown. Finding smallest, most easily eroded deposits on Mercury can help answer these questions. Here we evidence for volatiles trapped cold traps scales ∼ 1–10 m. We consider two possible delivery methods deposits: a gradual, slow...
Boulders form from a variety of geological processes, which their size, shape, and orientation may help us better understand. Furthermore, they represent potential hazards to spacecraft landing that need be characterized. However, mapping individual boulders across vast areas is extremely labor-intensive, often limiting the extent over are characterized statistical robustness obtained boulder morphometrics. To automate characterization, we use an instance segmentation neural network, Mask...
Abstract Solar irradiance dominates the heat flux incident on airless planetary bodies. In thermal equilibrium, surface roughness affects temperature distribution by changing incidence angle local to each slope. order simulate temperatures and emissions at different phase angles, existing thermophysical models usually employ computationally expensive techniques such as ray tracing. Here we derive equilibrium of sunlit Gaussian rough surfaces, providing an exact solution for Sun zenith...
Abstract In the absence of consistent meteorological data on Mars, morphology dunes can be employed to study its atmosphere. Specifically, barchan dunes, which form under approximately unimodal winds, are reliable proxies for dominant wind directions. Here, we characterize near‐surface winds Mars from >700,000 barchans mapped globally planet by a convolutional neural network. Barchan migration is predominantly aligned with known southern‐summer atmospheric circulation patterns—northerly...
Abstract Loose sand, blown away from source regions by winds, is transported across Mars's surface into sand sheets and dunes accumulates within topographic sinks. In the absence of plate tectonics, impact craters constitute a dominant sink for windblown sediments on Mars today. We analyzed volume all mapped eolian sands in martian >1 km diameter to reveal spatiotemporal patterns sediment accumulation planet's surface. combined our results with global climate simulations, maps depth...
Abstract Over 11 years of data acquired by the Diviner Lunar Radiometer Experiment instrument aboard Reconnaissance Orbiter have been compiled into a comprehensive set surface temperatures in Lacus Mortis region which includes landing ellipse Astrobotic Mission One lander mission. These provide diurnal brightness at 128 pixels per degree (ppd) spatial resolution and 0.1 hr local time resolution. From this set, we highlight several features that display variations radiative thermophysical...
The presence of meters-thick polar deposits exposed directly on the surface Mercury provides unique science opportunities that should be prioritized in next decade planetary exploration.The poles provide a natural laboratory for understanding chemical, physical, and thermal processes have governed supply, retention, modification, loss water other volatiles delivered to inner solar system through time.Polar are composed primarily ice, additional coincident organic-rich frozen offers nearby...