Spectrographic Imager (SI)

• SI Observations

  • Far ultraviolet imaging of the aurora
  • Image full Earth from apogee

• Measurement Requirement

  • FOV: 15° x 15° for aurora (image full Earth from apogee),
  • Spatial Resolution: 90 km
  • Spectral Resolution (top): Reject 130.4 nm and select 135.6 nm electron aurora emissions.
  • Spectral Resolution (bottom): 121.6 nm

• Storm/substorm Observations

  • Image Time: 2 minutes generating 720 images/day

• Derived Quantities

  • Structure and intensity of the electron aurora (top)
  • Structure