BackForwardInstrument:  CITRIS 

Instrument details
Acronym CITRIS
Full name Computerized Ionospheric Tomography Receiver In Space
Purpose To determine ionospheric electron density and provide a global ionospheric map to aid the prediction of radio-wave scattering.
Short description Three-frequency beacon, operating in association with a network of fixed ground receivers.
Background Consolidated technology.
Scanning Technique Moving along a low-inclination LEO
Resolution N/A
Coverage / Cycle Large fraction of magnetosphere and ionosphere
Mass Power Data Rate


Providing Agency NRL
Instrument Maturity Flown on an R&D satellite
Utilization Period: 2007 to 2009
Last update: 2017-04-21
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
Primary mission objectives
  • Ionospheric Vertical Total Electron Content (VTEC)
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
Ionospheric Radio Absorption1 - primaryNo specific limitation.Earth's limb. Active radio waves
Ionospheric Vertical Total Electron Content (VTEC)*1 - primaryNo specific limitation.Earth's limb. Active radio waves
Ionospheric Scintillation1 - primaryNo specific limitation.Earth's limb. Scintillations. Active radio waves