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• W5715423 abstract "Time dependent dust accumulation on the Telltale fibers was observed during the Phoenix mission. Laboratory experiments were performed to determine the critical wind speeds needed to remove the accumulated dust. 1. Observations The NASA Mars Mission Phoenix lasted 152 sols corresponding to Ls = 76° to 148° [1]. During this time wind speeds and directions were measured with a mechanical anemometer, the Telltale (Fig. 1), by analyzing the position of the Kapton cylinder in pictures taken with the Surface Stereo Imager (SSI). Figure 1: Color composite image of the Telltale taken on Ls ~ 119 [2] The Kevlar fibers were originally monitored for dust accumulation to assess the possible error to the wind measurements. Laboratory tests have shown that this effect introduces a negligible error, however the time dependency of the dust accumulation displays interesting features. Figure 2: Images of the Telltale taken around 15:35 LMST at the solar longitudes indicated [2]. The dust accumulation can be seen in the Telltale images (Fig. 2). Since neither the fibers nor the dust thereupon are optically thick, a dust factor was calculated assuming exponential absorption through the dust loaded fibers (Fig. 3). At Ls ~ 78 the dust accumulation is minor as seen from the contrast between the fibers and the background. This contrast increases steadily until Ls ~114. EPSC Abstracts Vol. 5, EPSC2010-388, 2010 European Planetary Science Congress 2010 c © Author(s) 2010 On later sols, the fibers appear thinner, indicating that they have been partially cleared of dust. The first major dust-devil days, were at Ls ~ 112o and Ls ~ 120o (Fig. 4), suggesting that dust devils could have cleaned dust off the fibers. The behavior appears to be more erratic hereafter, but there are clear indications of periods with accumulation and removal. 0 0,1 0,2 0,3 0,4 0,5 0,6 75 90 105 120 135 150 Solar longitude () du st fa ct or Figure 3: The calculated dust factor of the dust loaded fibers as a function of solar longitude. 0 5 10 15 20 25 30 35 40 45 50 75 90 105 120 135 150 Solar longtitude () O bs er ve d vo rti ce s/ so l Figure 4: Number of vortices per sol observed at the Phoenix landing site by characteristic 5-20 sec. drop in the pressure (from [3]). 2. Experimental work To determine if dust devils could clean the Telltale fibers a series of experiments were performed in the Aarhus Wind Tunnel Simulator (AWTS) [5] by depositing dust on fibers and increasing wind speeds until the dust was cleared. The dust deposition and removal experiment was repeated for 9, 10, 11, 14, 20 and 100 mbar with regular air in the wind tunnel and once at 9 mbar with CO2 gas. The experiments determined that dust was removed from the fibers at 10(2) m/s, which was achieved daily after Ls ~ 120° (Fig. 5). This date coincides with the beginning of the dust devil season (Fig. 4) and corresponds with the period of dust removal as observed during the mission (Fig. 3)." @default.
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• W5715423 date "2010-01-23" @default.
• W5715423 modified "2023-09-23" @default.
• W5715423 title "Time-dependent Dust Accumulation on the Mars Phoenix Wind Indicator" @default.
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