2.2.6 spase://SMWG/Instrument/MMS/3/InstrumentControl/ASPOC MMS 3 Active Spacecraft Potential Control (ASPOC) Instrument MMS 3 ASPOC 2021-07-20T13:41:27Z The Active Spacecraft Potential Control (ASPOC) generates beams of indium ions to limit positive spacecraft potentials to within +4V in order to improve the measurements obtained by the follwinf MMS instruments: FPI, HPCA, ADP, and SDP. There are two ASPOC units per MMS spacecraft. The ASPOC Lead Co-I for Phase E is Rumi Nakamura (IFW, OAF). spase://SMWG/Person/James.L.Burch PrincipalInvestigator spase://SMWG/Person/Rumi.Nakamura CoInvestigator Mission instrument web page https://www.nasa.gov/mission_pages/mms/spacecraft/mms-instruments.html Mission web page that describes the payload (instruments) on each spacecraft. English SpacecraftPotentialControl MMS 3 Active Spacecraft Potential Control 2015-03-13T02:44:00 spase://SMWG/Observatory/MMS/3