Abstract
The Plasma Source Instrument (PSI) on the POLAR satellite is demonstrated to effectively clamp the spacecraft potential to +1.8 V, permitting the measurement of low energy ions which would otherwise be unobservable. Effects of PSI operations on observations of low frequency electric fields by the Electric Field Instrument (EFI) and observations of 1-lOkHz waves by the Plasma Wave Investigation are also shown. Since the EFI observations indicate a disturbance of the sheath electric field surrounding the spacecraft, a crude model is proposed to explain the nature of the disturbance, and to thereby provide a means for addressing possible consequences for low energy particle observations.
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