polar-orbiting satellite
Satellite that travels in a polar orbit around the globe 14 times per day; this allows it to cover the entire surface of the globe, due to the Earth’s rotation.
solar array
Power supply device that converts solar energy into immediately usable electrical energy.
radiometer
Instrument designed to measure electromagnetic radiation energy at a given frequency.
thermal louver
Adjustable mechanical component designed to modify thermal flux.
reaction engine assembly
Micromotor that makes it possible to direct a satellite to the desired position.
ultraviolet spectrometer
Instrument that monitors ozone levels in the Earth’s atmosphere.
S-band antenna
Antenna that enables a satellite to transmit the data it collects to the terrestrial station.
Earth radiation sensor
Radiometer that measures solar radiation and reflection in the Earth’s atmosphere.
Earth radiation scanner
Radiometer that analyzes a region of the globe by means of repeated scans.
microwave scanner
Instrument that produces an image of an observed area even in cloudy conditions since microwave frequencies pass through clouds.
Earth sensor
Instrument that locates the Earth’s horizon so that the antenna can be positioned correctly.
infrared sounder
Instrument that measures thermal energy in clouds and on the Earth’s surface with a view to capturing nighttime images of weather systems and cloud cover.
Sun sensor
Instrument that positions the solar panels in the direction of the Sun to capture its energy.
search-and-rescue antennas
Device that picks up distress signals emitted by ships or aircraft and makes it possible to determine their location.
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