I read a Science news story on electric fields in dust storms on Earth http://www.sciencemag.org/news/2016/07/static-electricity-strengthens-desert-dust-storms?utm_campaign=news_weekly_2016-07-15&et_rid=33531171&et_cid=637535. A quick Google leads to NASA research on electric filed on dust devils on earth http://www.nasa.gov/home/hqnews/2004/apr/HQ_04131_mars_dust.html. Does anyone here know if researches ever considered placing a small instrument to measure electric and magnetic fields on a rover? If Spirit and Opportunity had such instruments, we would have gotten great data during near fatal dust storm and also all the cleaning events they experienced. I would be surprised if a combined magnetic and electric field monitor with data logger could not be built weighing significantly less than an ounce.
Dust devils on earth create huge electric fields of up to 4,000 volts/meter and also contain magnetic fields. It would be good to ground truth this dust lifting phenomenon on Mars.
I think there is one such instrument on ESA's Schiaparelli due to land next October
That's http://mars.mines.edu/pub/91SDMars.pdf, in my understanding mainly to find an upper bound of the electrostatic field on Mars, in order to estimate possible hazards for any equipment on Mars. http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20110008730.pdf.
There is still a puzzle about cause and effect of the Martian dust devils and electrostatics.
As far as I understand, the electrostatic field on Mars is well below breakdown, but any remote measurements from Earth appear to be rather sophisticated.
So, I'm looking forward to Schiaparelli's results, too.
Great that there will be instruments on Schiaparelli. Doesn't look like Mars 2020 will have this capability and I think all science instruments are selected at this point.
MOD NOTE: Edited topic title for clarity.
EDIT: Twice.
For reference: The instrument on Schiaparelli is called MicroARES and is part of the DREAMS instrument package for surface operation.
http://meetingorganizer.copernicus.org/EPSC2015/EPSC2015-508.pdf
http://exploration.esa.int/mars/56535-microares-flight-model/
P.S.: The surface platform of ExoMars 2018, now renamed ExoMars 2020, will also have a Russian-built electric field sensor under the current proposal.
See http://exploration.esa.int/science-e/www/object/doc.cfm?fobjectid=55699 (ESA) and https://hal.archives-ouvertes.fr/hal-01133960/.
I'm a non-expert on this, but ultraviolet light plays a role in electrostatics that would be seemingly much different on Mars than Earth. The photoelectric effect can cause discharges at small levels before they build up, which would make me suspect that blowing dust on Mars would be less capable of carrying large charges than on Earth. Now, caveats galore:
• That wouldn't apply at night.
• Dense dust clouds might block the UV.
• That's only one factor and doesn't take into account the different composition of the dust, air, temperature, pressure, humidity.
It's a fascinating topic. As we've seen with the disputed existence of lightning on Venus, this is a kind of area where theory is not very accurately predictive and empirical observations are essential. In fact, certain manifestations of lightning on Earth have been controversial or gone undiscovered into recent times.
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