Abstract

The electric field and conductivity of the atmosphere were measured above thunderstorms in the central Florida area in a series of twenty-five balloon flights made at altitudes ranging from 70,000 to 90,000 ft above sea level. These tests indicate that at these altitudes and for the storms investigated there is a positive current of approximately 1.3 A, on the average, flowing upward from the top of the thunderstorm toward the ionosphere and confirm Wilson's hypothesis that thunderstorms are the generators which supply the electric current necessary for maintaining the earth's negative charge.

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