Table 2 FY-3WAI requirement summary

From: Wide-field auroral imager onboard the Fengyun satellite

Parameter Value
Wavelength 140–180 nm (FY-3D)
140–160 nm, 160–180 nm (FY-3F)
Field of view (instantaneous) 130° (cross-track) × 10° (along-track)
Along-track sweeping range ±60° from the nadir
Angular resolution 0.8° (10 km at the nadir in disk images)
Sensitivity >0.01 counts s−1 Rayleigh−1 pixel−1 (140–180 nm)
Nadir pointing accuracy <0.16°
Image frame rate <2 min for scanning mode
~100 min for nadir mode