BackForwardInstrument:  ASPOC (MMS) 

Instrument details
Acronym ASPOC (MMS)
Full name Active Spacecraft Potential Control Devices
Purpose To enable measurement of low-energy ions and electrons by the plasma instruments and eliminate spurious electric fields that can contaminate double-probe measurements
Short description Device emitting ions towards space to neutralise the electrical charge acquired by the platform.
Background Part of a package of instruments to implement the SMART (Solving Magnetospheric Acceleration, Reconnection, and Turbulence) mission
Scanning Technique 4 satellites co-flying in tetrehedral pattern, moving to different positions into the Magnetosphere for 3-D field reconstruction
Resolution N/A
Coverage / Cycle Full magnetospheric volume
Mass Power Data Rate


Providing Agency NASA
Instrument Maturity Flown on an R&D satellite
Utilization Period: 2015 to ≥2021
Last update: 2016-03-20
Detailed characteristics
Satellites this instrument is flying on

Note: a red tag indicates satellites no longer operational, a green tag indicates operational satellites, a blue tag indicates future satellites

Instrument classification
  • Solar and space environment monitors
  • Field or radiowave sensor
WIGOS Subcomponents No WIGOS subcomponents have been defined.
Mission objectives
Opportunity objectives
  • Electrostatic charge
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Tentative Evaluation of Measurements

The following list indicates which measurements can typically be retrieved from this category of instrument. To see a full Gap Analysis by Variable, click on the respective variable.

Note: table can be sorted by clicking on the column headers
VariableRelevance for measuring this variableOperational limitationsExplanation
Electrostatic charge3 - highNo specific limitation.Platform. Electrostatic charge