BackForwardInstrument:  NMS 

Instrument details
Acronym NMS
Full name Neutral Mass and Velocity Spectrometer
Purpose To measure the density and velocity of neutral atmospheric species
Short description Complex of an open-source electron impact ionization chamber and a microchannel plate imaging detection subassembly. Energy range: 0.00005-0.02 eV
Background Part of a package of instruments to study the Magnetosphere
Scanning Technique Travelling cross the lower Magnetosphere in an elliptical orbit
Resolution N/A
Coverage / Cycle Lower magnetosphere, daily
Mass Power Data Rate


Providing Agency JAXA
Instrument Maturity Flown on an R&D satellite
Utilization Period: 2014 to 2021
Last update: 2021-10-02
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
  • Energetic particle spectrometer
WIGOS Subcomponents
  • Subcomponent 3
  • Neutral and Ion Mass Spectrometer
  • Energetic Neutral Atom spectrometer [from LEO and HEO]
Mission objectives
Primary mission objectives
  • Energetic Neutral Atom (ENA)
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
Note: * Primary mission objective.
VariableRelevance for measuring this variableOperational limitationsExplanation
Energetic Neutral Atom (ENA)*5 - marginalNo specific limitation.Interplanetary space, very low energy (<10 eV)