Changes for page Amadee-20-SANDEE
Last modified by Barry Bishop on 2019/08/17 15:56
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... ... @@ -8,7 +8,7 @@ 8 8 9 9 === Summary === 10 10 11 -(% class="image" 11 +(% class="image" %) 12 12 ((( 13 13 [[image:SANDEE_manifest.png]] 14 14 ... ... @@ -17,20 +17,8 @@ 17 17 ))) 18 18 ))) 19 19 20 -When small airborne dust particles, carried by the wind, collide and rub against other 21 -suspended particles or against the surface, they may redistribute charge between them. This 22 -leads to the phenomenon of the electrification of mineral dust clouds. The efficiency of the 23 -process and the sign of the charge a particle acquires depends on its properties, like e.g. shape 24 -or mineralogy. By analogy to these processes on Earth, it is to be expected that sand- and dust 25 -storms on Mars are electrically charged to some degree, as well. This would have important 26 -implications for lander operations, orbiter-lander communication and future human missions. 20 +When small airborne dust particles, carried by the wind, collide and rub against other suspended particles or against the surface, they may redistribute charge between them. This leads to the phenomenon of the electrification of mineral dust clouds. The efficiency of the process and the sign of the charge a particle acquires depends on its properties, like e.g. shape or mineralogy. By analogy to these processes on Earth, it is to be expected that sand- and dust storms on Mars are electrically charged to some degree, as well. This would have important implications for lander operations, orbiter-lander communication and future human missions. 27 27 28 -The SANDEE experiment aims to address several scientific questions regarding the described 29 -phenomenon by simulating sandstorms and measuring their dynamic, mineralogical and 30 -electrical characteristics. In the experiment the behavior of soil samples collected on-site in a 31 -BGU boundary layer wind tunnel is to be investigated. In the tunnel, the soil samples will be 32 -subjected to various wind speeds comparable with typical winds in the Negev desert. 22 +The SANDEE experiment aims to address several scientific questions regarding the described phenomenon by simulating sandstorms and measuring their dynamic, mineralogical and electrical characteristics. In the experiment the behaviour of soil samples collected on-site in a BGU boundary layer wind tunnel is to be investigated. In the tunnel, the soil samples will be subjected to various wind speeds comparable with typical winds in the Negev desert. 33 33 34 -The team plans for two measurement runs, one at daytime and one at night-time. The aim of 35 -the night-time run is to include high-speed imaging of the sand movement inside the wind- 36 -tunnel, in an attempt to detect corona discharges and light emission during eolian transport. 24 +The team plans for two measurement runs, one at daytime and one at night-time. The aim of the night-time run is to include high-speed imaging of the sand movement inside the wind-tunnel, in an attempt to detect corona discharges and light emission during eolian transport.