Electric Field Intensity Inside of Natural Clouds

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Abstract
Measurements of the electric field on the surface of aircraft flying through all types of weather and clouds are summarized. The measured electric field inside a thunderstorm just prior to a lightning strike at 12,900 feet was 3400 volts/cm. The average maximum field for 9 different thunderclouds was 1300 volts/cm. It is noted that large fields usually occur only inside the cloud and at altitudes somewhat comparable to the freezing level. Frequent reversals of the field are observed in these areas. The electric field measured inside a stable non‐precipitating cloud is less than 10 volts/cm.

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