Abstract

A space charge sheath is found to be formed whenever a high-velocity magnetized plasma stream penetrates a gas cloud. The sheath is always located at the head of the plasma stream, and its thickness is very small compared to the length of the plasma stream. Soon after the sheath is formed it quickly slows down to the Alfven critical velocity. The plasma behind the sheath continues to move at higher velocity until the whole plasma stream is retarded to the critical velocity. In the interaction at gas density ≈1019 m−3 the sheaths are observed to be accompanied by a single loop of current with current density of ≈105 A m−2. Maximum potential in the sheath ranges between 50 and 200 V.

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