The CINDI instruments provide measurements of the neutral wind velocity vector and the ion drift velocity vector. Both the Neutral Wind Meter (NWM) and the Ion Velocity Meter (IVM) are mounted on a spin stabilized satellite to view approximately along the velocity vector. Each of these instrumnents consists of two sensors which utilize the same principles to measure the vector velocity.
The Neutral Wind Meter consists of two sensors.
The Ram Wind Sensor (RWS) measures the kinetic energy of the neutral gas along the sensor look direction and the Cross-Track Sensor (CTS) measures the arrival angle of the gas in two mutually perpendicular planes containing the sensor look direction.
The Ion Velocity Meter also consists of two sensors.
The Retarding Potential Analyzer (RPA) measures the kinetic energy of the ambient ions along the sensor look direction and the Ion Drift Meter (IDM) measures the arrival angle of the ions in two mutually perpendicular planes containing the sensor look direction.
The CINDI instruments form part of the payload for the AirForce C/NOFS satellite. The data will not only be used to conduct this NASA sponsored investigation but also will become an important input to the specification and prediction efforts being undertaken by C/NOFS.