OOMG member Dr. Joe Zambon tested a balloon-carried radiosonde with the help of NCSU’s Dr. Matt Parker from the roof of Jordan Hall. After filling the large balloon with helium, Joe and Matt zip-tied it closed, then attached the unwinder.
![Unwinder](http://52.90.142.113/wp-content/uploads/2017/12/20171219_142016.jpg)
Between the balloon and the radiosonde, the unwinder gently spools out 10 m of string so that the radiosonde is far enough below the balloon to get a clear signal from GPS satellites.
![radiosonde](http://52.90.142.113/wp-content/uploads/2017/12/rasonde-instrument.jpg)
The lightweight radiosonde connects to the unwinder and bears an antenna for satellite and ground communication and an instrument that takes measurements as it travels through the atmosphere.
![Ballon in sky](http://52.90.142.113/wp-content/uploads/2017/12/20171219_142103.jpg)
Joe will be launching a dozen radiosondes from the deck of the R/V Neil Armstrong during the January 2018 PEACH research cruise to collect data on the atmosphere while other instruments are collecting data on the ocean. Ocean-atmosphere interactions are critical to understanding ocean conditions. The radiosonde will record conditions such as humidity, temperature, and pressure as it rises. A small battery in the radiosonde enables it to transmit data back to the ground in real time. The balloon may carry the instrument through the troposphere (~ 17 km above the Earth’s surface), eventually bursting due to low atmospheric pressure.