|Title||Point discharge current measurements beneath dust devils|
|Publication Type||Journal Article|
|Year of Publication||2016|
|Authors||Lorenz RD, Neakrase LDV, Anderson JP, R. Harrison G, Nicoll KA|
|Journal||Journal of Atmospheric and Solar–Terrestrial Physics|
|ARIS Log Number||335735|
|Keywords||atmospheric electricity, dust devils, meteorology|
We document for the first time observations of point discharge currents under dust devils using a novel compact sensor deployed in summer 2016 at the USDA-ARS Jornada Experimental Range in New Mexico, USA. A consistent signature is noted in about a dozen events seen over 40 days, with a positive current ramping up towards closest approach, switching to a decaying negative current as the devil recedes. The currents, induced on a small wire about 10 cm above the ground, correlate with dust devil intensity (pressure drop) and dust loading, and reached several hundred picoAmps.