Langley Voltage Offset or V0 (referred to as V naught) represents a hypothetical voltage reading that the detector amplifier system would have if it were making its measurement at the top of the atmosphere where the optical depth is zero. This instrument characteristic is used to derive a responsivity of the respective channels assuming the extraterrestrial solar spectral irradiance is known and constant.
Valid date range for location Alaska, Fairbanks, AK01, AK02 is from Sat Aug 26 00:00:00 GMT+00:00 2000 to Thu Dec 31 19:03:51 GMT+00:00 2020