Dust storm activity appears to pick up south of Opportunity by Staff Writers Pasadena CA (JPL) Jan 18, 2019
Dust storm activity appears to have picked up again, with a regional storm tracking south about 124 miles (200 kilometers) to the west of Opportunity. The storm is expected to increase in opacity (tau) at the rover site to greater than 1.5 over the next few days. No signal from Opportunity has been heard since Sol 5111 (June 10, 2018) during the historic global dust storm. Opportunity likely experienced a low-power fault, a mission clock fault and an up-loss timer fault. Since the loss of signal, the team has been listening for the rover over a broad range of times, frequencies and polarizations using the Deep Space Network (DSN) Radio Science Receiver. They have been commanding "sweep and beeps" throughout each daily DSN pass with both right-hand and left-hand circular polarization to address a possible complexity with certain conditions within mission clock fault on the rover. They have expanded the breath of "sweep and beeps" commanding covering more times of day on Mars. Mars is now in the seasonal period of past dust clearing events for the rover. Since loss of signal, 560 recovery commands have been radiated to the rover. Total odometry is unchanged at 28.06 miles (45.16 kilometers).
Research helps in understanding the dynamics of dune formation Sao Paulo, Brazil (SPX) Nov 27, 2018 Crescent-shaped dunes called barchans are structures that appear in a wide variety of environments, including beaches and deserts, riverbeds and the seafloor, inside water pipes and oil pipelines, and on the surface of Mars and other sandy planets with an atmosphere. Despite differences in scale varying from ten-centimeter ripples for underwater dunes to kilometer-high mountains for Martian dunes, the dynamics of barchan formation and motion appear to be highly similar everywhere. Research c ... read more
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