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The development of ERB observational systems is traced from its beginnings in the late 1950's through to the current ERB on the NIMBUS 7 satellite. The instruments comprising the current 22‐channel ERB experiment are described in some detail. Noteworthy are the inclusion in one solar channel, of a self‐calibrating cavity to measure the solar constant and the use of biaxial scanning telescopes to determine the angular reflection and emission model required for processing the narrow‐angle radiometric data. A fairly detailed description of the prelaunch and in‐flight calibrations is given along with an analysis of the radiometric performance of the instruments. The data processing system is traced with the aid of a schematic flow diagram showing the steps required to produce the many tape and microfilm products archived. Future plans for improving the quality and accuracy of the data products are discussed. Finally, the upcoming Earth Radiation Budget Experiment (ERBE) is briefly mentioned. It will be capable of simultaneously measuring the radiation budget from three satellites, each having a different equator crossing time and angle.
Jacobowitz et al. (Sat,) studied this question.
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