Abstract
Electrostatic charging of the orbiter has been studied by the Space Shuttle/Spacelab-1 using the Space Experiments with Particle Accelerators (SEPAC). Charging of the orbiter due to electron beam emission has been analyzed using data from a Langmuir probe, floating probes, an electron energy analyzer and a low-light-level TV camera. Charging of the orbiter is found to be strongly dependent upon the attitude of the orbiter with respect to the velocity vector. The orbiter potential has reached the beam acceleration voltage well beyond one kilovolt, which is much higher than that previously observed in electron beam experiments on sounding rockets in the lower ionosphere.
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