Measurement of corona current density at an electrode boundary

A technique and instrument [known as the microarea boundary electrode Langmuirian (MABEL)] have been developed for fine-scale measurement of steady-state corona current to an electrode boundary. The results of measurements of negative corona in air at n.t.p. are described. Sharp cutoff at the edges of such corona have been observed. Dead bands with zero current have been repeatedly measured between interacting space clouds.