A5033359524- Planetary Science and Exploration
- Aeolian processes and effects
- Astro and Planetary Science
- Space Exploration and Technology
- Geology and Paleoclimatology Research
- Particle Dynamics in Fluid Flows
- Atmospheric aerosols and clouds
- Space Science and Extraterrestrial Life
- Meteorological Phenomena and Simulations
- Spacecraft and Cryogenic Technologies
- Distributed and Parallel Computing Systems
- Spaceflight effects on biology
- Astronomical Observations and Instrumentation
- Marine and environmental studies
- Biocrusts and Microbial Ecology
- Wind Energy Research and Development
- Geophysics and Gravity Measurements
- Aerodynamics and Fluid Dynamics Research
- Spacecraft Design and Technology
- Wind and Air Flow Studies
- Advanced Computational Techniques and Applications
- Space Satellite Systems and Control
- Atmospheric and Environmental Gas Dynamics
- demographic modeling and climate adaptation
- Big Data Technologies and Applications
New Mexico State University
2010-2022
Arizona State University
2001-2010
A full dust devil “season” was observed from Spirit 10 March 2005 (sol 421, first active observed) to 12 December 691, last seen); this corresponds the period L s 173.2° 339.5°, or southern spring and summer on Mars. Thermal Emission Spectrometer data suggest a correlation between high surface temperatures positive thermal gradient with devils in Gusev that landed waning stages of season as decreased. 533 were observed, enabling new characterizations; they ranged diameter 2 276 m, most range...
Wind‐related features observed by the rover Spirit in Gusev crater, Mars, include patches of soil on surface, some which are organized into bed forms. Windblown grains dust (inferred to be <3 μm diameter), sands (up a few hundred and granules (>2 mm diameter). Microscopic Imager data show rounded relatively spherical, typical transported long distances wind. The interior forms exposed operations suggests infiltration among grains, indicating that these not currently experiencing...
Spirit began operations in Gusev Crater January 2004 and has returned data on three seasons of dust devil (DD) activity. Total DDs observed were 533 season one, 101 two, 127 three. Their general characteristics are the same within factors 2 among seasons, with median diameters 19 m 24 39 three, flux values for individual vortices ranging from 4.0 × 10 −9 to 4.6 −4 kg −2 s −1 5.2 −7 6.2 −5 1.5 1.6 All initiated onset southern Martian spring 14 sols L (181°) their frequency increased period...
Linear, low‐albedo patterns (termed dark wind streaks) formed on the floor of Gusev crater between September 2003 and February 2004, as seen High Resolution Stereo Camera images taken board Mars Express Orbiter. Pancam from Exploration Rover Spirit show that rover crossed a streak during its traverse to Bonneville crater. Microscopic Imager data reveal sand grains within are relatively free dust, whereas outside mantled with dust. During 2004 solar conjunction, remained in one location sol...
Abundant wind‐related features occur along Spirit's traverse into the Columbia Hills over basaltic plains of Gusev Crater. Most windblown sands are probably derived from weathering rocks within crater, and possibly deposits associated with Ma'adim Vallis. Windblown particles act as agents abrasion, forming ventifacts, organized in places various bed forms. Wind‐related seen orbit, results atmospheric models, considerations topography suggest that general wind patterns transport pathways...
We quantified and classified the shape, roundness, size, texture of 935 loose surface particles along Spirit rover traverse from sols 450–745 to assess origin, transport, other alteration mechanisms that altered during after formation. Variation in particle morphologic parameters is consistent with crossing mapped geologic unit boundaries. Texture divided into four types: vesicular, smooth flat‐faceted, rough very rough. Sphericity roundness are intermediate low, respectively, comparable...
Laboratory simulations using the Arizona State University Vortex Generator (ASUVG) were run to simulate dust flux in devils. These tests used particles 2 μ m diameter and 2600 kg −3 density, results compared with data from natural devils on Earth Mars. Typically, cores of (regardless planetary environment) have a pressure drop ∼0.2–1.5 percent ambient atmospheric pressure. Core drops our experiments ranged ∼0.01 5.00 (10 mbar Mars cases 1000 for cases). Flux at vortex tangential wind...
Experiments simulating vortex interactions with rough surfaces were conducted at Earth ambient and Mars analog atmospheric conditions. Pressure profiles obtained to assess the effect of nonerodible roughness elements on structure surface. As increased, size increased tangential velocity decreased. Particle threshold experimental results suggested that small increases in surface enabled reduced velocities lift fine particles (<100 μ m) from This “optimal roughness” or amount necessary for...
Active dust devils (atmospheric vortices with entrained dust) seen on Mars leave surface tracks inferred to result from the injection of loose particles into atmosphere, typically exposing a darker (or, in some cases brighter) substrate. Hundreds similar appearing are common many areas, but absence imaging active responsible for their formation, it has not been possible determine direction forward motion vortex. Laboratory experiments simulating show that overlapping scallops enable be determined.
Acquisition of science in space applications is shifting from teleoperated gathering to an automated on-board analysis with improvements the use memory, CPU, bandwidth and data quality. In this paper, we describe algorithms autonomously detect dust devils clouds a rover summarize results. The meet high hit-to-miss ratios satisfy strict resource constraints. Both detectors have been uploaded Mars exploration rovers (MER). These are first autonomous processes rovers.
Written by: Claire E. Newman (Aeolis Res.) Tanguy Bertrand (NASA Ames) Joseph Battalio (Yale Univ.) Mackenzie Day (UCLA) Manuel de la Torre Juarez (JPL) Meredith K. Elrod GSFC) Francesca Esposito (INAF-OAC) Lori Fenton (SETI Inst.) Claus Gebhardt (UAEU) Steven J. Greybush (Penn. State) Scott D. Guzewich Henrik Kahanpaa (FMI) Melinda Kahre Ozgur Karatekin (Royal Obs. Belg.) Brian Jackson (Boise State Mathieu Lapotre (Stanford Christopher Lee Stephen R. Lewis (Open Ralph Lorenz (APL) German...