Electrostatic Potential Generated by Rockets on Vehicles in Space

Investigators have reported the existence of electric current in the exhaust plumes of rocket engines and have speculated that this current could generate a sufficiently high electrostatic potential on vehicles in space to interfere with or damage electronic subsystems or instrumentation. This paper identifies the source of the observed current, calculates its magnitude as a function of the engine parameters, and demonstrates that the rocket plume itself can discharge a vehicle in space and prevent buildup of dangerous potentials.