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Instrument: RDEFM : Rotating Dipole Electric Field Mill
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The Rotating Dipole Electric Field Mill (RDEFM) is used to 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.

[Summary provided by NASA]

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