NISTARNIST Advanced Radiometer
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The NISTAR instrument's optical responsivity and other characteristics were measured using a wide variety of laser wavelengths in the range 488 nm to 850 nm (blue, green, red, near-infrared), during these tests, the NISTAR instrument was in a space-simulating thermal vacuum chamber, viewing the SIRCUS light through windows.
As Antarctica tilts towards the sun in November, NISTARs signal edges up as the massive ice sheet changes the planets energy budget.