Part 1: Instrumentation, network and processing -- Chapter 1.The IMS Infrasound Network: Status and state-of-the-art design (Julien Mary) -- Chapter 2. New generations of infrasound sensors: Technological developments and calibration (G. Nief) -- Chapter 3. New systems for wind noise reduction for infrasonic measurements (Jeremy Webster) -- Chapter 4. Geoacoustic observations on drifting balloo…