Physics
Scientific paper
Mar 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004p%26ss...52..279m&link_type=abstract
Planetary and Space Science, Volume 52, Issue 4, p. 279-290.
Physics
25
Mars, Wind Tunnel, Mars Dust, Electrical Charging, Dust Sticking
Scientific paper
Dust is a major environmental factor on the surface and in the atmosphere of Mars. Knowing the electrical charge state of this dust would be of both scientific interest and important for the safety of instruments on the Martian surface. In this study the first measurements have been performed of dust electrification using suspended Mars analogue material. This has been achieved by attracting suspended dust onto electrodes placed inside a Mars simulation wind tunnel. The Mars analogue used was from Salten Skov in Denmark, this contained a high concentration of ferric oxide precipitate. Once suspended, this dust was found to consist of almost equal quantities of negatively (46+/-6%) and positively (44+/-15%) charged grains.
These grains were estimated to typically carry a net charge of around 105e, this is sufficient to dominate the processes of adhesion and cohesion of this suspended dust. Evidence is presented for electrostatic aggregation of the dust while in suspension. Development of a simple instrument for measuring electrical charging of the suspended dust on Mars will be discussed.
Jensen Jacqueline
Kinch Kjartan
Merrison Jon
Mugford R.
Nørnberg Per
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