Electrical discharge phenomena occurring from a grounded electrode located in a charged particles cloud have been investigated. Soil conditioning powder particles charged by corona charging were blown to form a space charge cloud. A grounded sphere electrode was placed at the center of the charged cloud to produce an electrical discharge. Positively pulse discharge from the sphere electrode toward the charged cloud with a strong luminescence. The brush-like streamer with the maximum length of 170mm appeared at an interval of 30ms. The maximum pulse height of the discharge was 2.4A.
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