There will be no more total solar irradiance measurements made by Nimbus-7.
Values are in watts per square meter.
In contrast to previous data releases, data for missing days are not filled, but rather omitted. Also, starting in 1990 a daily cycle appeared in the solar irradiances from unknown causes. In 1993 most of the days are missing since the Sun could not be acquired. Finally, daily averages formed with 3 or fewer observations should be considered less reliable than other days. Users may want to omit them or replace them with interpolated values.