In several field campaigns, these field mills have been installed on the top and bottom of a DC-8 and an ER-2 aircraft. With this configuration, the field mills are used to measure the vertical component of the electric field as the aircraft flies in the vicinity of electrified clouds. The dynamic range of these instruments extends from the fair weather fields (a few tens of V/m) to large thunderstorm fields (thousands of V/m). Using these field mills, it is possible to detect both intracloud and cloud-to-ground lightning from the abrupt electric field changes in the data. The field mills were developed by NASA/MSFC.