Routine monitoring of the Earth's horizon radiance in the 14-16 micron band is necessary because the data can be used for the design of more efficient horizon sensors on spacecraft. The seasonal latitudinal and longitudinal changes in the radiance also need to be monitored for understanding atmospheric dynamics. With these objectives and also to characterize the influence of the Sun and Moon on horizon sensors, an Earth Sensor Radiance Monitor (ESRM) was designed, fabricated and integrated with the Indian Remote Sensing Satellite spacecraft for launch from the East coast of India. The ESRM is described in this paper.
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