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Dear finder
Have you found a Swiss radio sonde?
These sondes are started two times a day by the Aerological Station Payerne (a regional office of the Swiss Meteorological Institute). A hydrogen-filled rubber balloon with a diameter of approx. 2 metres carries the sonde to an altitude of up to 35'000 metres within 90 minutes. At this altitude the balloon bursts and the sonde, suspended on a parachute, glides back to earth. During its flight the sonde has radio contact with the ground station in Payerne, Switzerland. The sonde contains instruments that measure the temperature, humidity and ozone concentration. The readings are transmitted to the ground station by a small sonde transmitter. These signals are received by the radar unit which also measures the wind velocity and wind direction. The results are evaluated by a computer in Payerne and immediately exchanged in the international network of meteorological services. The data are important for aeronautical weather service, weather forecast and environmental research.
As the sonde can be re-utilized we kindly ask you to return it.
As a rule a plastic pouch containing our address is attached to the sonde. If this material is missing, you can obtain the necessary information here