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Instrument Type: sounder and profiler, Operational Mode: cross-track, Collection Type: stepped-line scanning, Other Information: AMSU-A is a 15-channel cross-track, stepped-line scanning, total power microwave radiometer. The instrument has an instantaneous field-of-view of 3.3 degrees at the half-power points providing a nominal spatial resolution at nadir of 48 km (29.8 mi). The antenna provides a cross-track scan, scanning +48.3 degrees (-48.3 degrees) from nadir with a total of 30 Earth fields-of-view per scan line. This instrument completes one scan every 8 seconds.