electric field strength
From Glossary of Meteorology
(Also called electric field, electric intensity, electric field intensity, electric potential gradient, field strength, and probably others.) The electrical force exerted on a unit positive charge placed at a given point in space.
The electric field strength is expressed, in the mks system of electrical units, in terms of volts per meter and is a vector quantity. The electric field strength of the atmosphere is commonly referred to as the atmospheric electric field.