Émetteur sur ballon-sonde qui envoie au sol des informations météorologiques.
Radio transmitter in balloon used to gather weather data.
Radio transmitter, borne into and from upper atmosphere by balloon and parachute, sending out information on atmospheric conditions.
Balloon carrying a compact package of meteorological instruments and a radio transmitter, used to “sound”, or measure, conditions in the atmosphere. The instruments measure temperature, pressure, and humidity, and the information gathered is transmitted back to observers on the ground. A radar target is often attached, allowing the balloon to be tracked.