Martian crater dark streak lengths - Explanation from wind tunnel experiments

Physics

Scientific paper

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Environment Simulation, Mars Craters, Planetary Evolution, Wind Tunnel Tests, Diameters, Dust, Planetary Environments, Wakes, Wind Effects, Mars, Craters, Streaks, Wind, Experiments, Simulations, Particles, Parameters, Velocity, Size, Calculations, Models, Diameter, Data

Scientific paper

The mechanism determining the length of dark erosional (type-Id) streaks near craters and hills on the surface of Mars is investigated using Mariner-9 images and the results of wind-tunnel studies (Greeley et al., 1974; Iversen et al., 1975 and 1976). An empirical model of time-dependent growth of crater-wake streaks in the downwind direction involving deflation by sand-grain saltation is developed and shown to give relatively good agreement with streak growth rates observed over a 38-day period of Mariner observations and with the streak-length/crater-diameter and streak-length/crater-height ratios analyzed statistically by Lee (1984). This time-dependent mechanism is thus considered a reasonable alternative (for dark streaks) to the blocking model proposed by Lee for both bright and dark streaks. Preliminary analysis of further wind-tunnel experiments (Iversen et al., 1982) supports the blocking model of bright-streak formation.

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