Global horizontal sounding technique

The global horizontal sounding technique (GHOST) program was an atmospheric field research project in the late 1960s for investigating the technical ability to gather weather data using hundreds of simultaneous long-duration balloons for very long-range global scale numerical weather prediction in preparation for the Global Atmospheric Research Program (GARP). == Technology == The GHOST program was to demonstrate technology for a program that would, ultimately, gather data from thousands of balloons simultaneously.

Source: Wikipedia — Global horizontal sounding technique (CC BY-SA 4.0)