The sonde

thesonde.jpg

The ozone-measuring cells are inside the white box. Temperature, relative humidity, and pressure sensors, as well as the radio transmitter, are in the small blueish attachment on the side. Note also the dropper attached to the base of the balloon - this ensures that the sonde hangs well below the balloon, so it won't be affected by local changes caused by the balloon itself.

Photo by Bec

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