Radiosondes are battery-powered telemetry instrument packages carried into the atmosphere by a weather balloon, measuring various atmospheric parameters and transmitting them by radio to a ground receiver.

The SPARC houses a radiosonde receiving station, as well as helium tanks for inflating and launching weather balloons.

SSEC scientist Brad Pierce launching a radiosonde at the Boulder Atmospheric Observatory in support of the Front Range Air Pollution and Photochemistry Experiment (FRAPPE) in 2014. Credit: John Lalande, SSEC.