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RadiosondeA radiosonde is a unit for use in weather balloons that measures various atmospheric parameters and transmits them to a fixed receiver. A frequency band at 403 MHz is reserved for radiosondes. The device is tied to a helium filled balloon, which lifts the device up through the atmosphere. The balloon bursts at about 30000 meters due to lack of external air pressure at that altitude. The modern rawinsonde communicates via radio with a computer that stores all the variables at real time. The first rawinsondes were observed from the ground with a theodolite, and gave only a wind estimation by the position. The most important variables measured by a modern radiosonde are: With the data, is possible to draw Stve diagrams, which are useful for the interpretation of phenomena such as thermal inversion. The weight of a radiosonde is typically 250 grams. A major manufacturer is Vaisala in Finland.
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