Infrasound recordings from an array of microbarometers onboard three stratospheric balloons launched from Esrange Space Center, Kiruna, Sweden, on August 20, 2020

Three balloons (B1-B3) were launched from ESRANGE Space Center (67.89 N, 21.08 E) on August 20, 2020. The balloons were designed to carry two payload boxes, separated by a 100 meter tether. Each payload box contained a DiGOS DATA-CUBE, recording three InfraBSU infrasound microbarometers at 400 Hz. One microbarometer recorded true polarity of acoustic signals, another recorded reversed polarity, and flow filters covered both ports on the final microphone, preventing acoustic waves from registering on the device. This data set contains a combination of data from the first and second microphones. In subtracting the polarity-reversed data from the true-polarity data, we expect acoustic signals to remain intact and non acoustic noise sources (e. g. electromagnetic interference, vibration) to be removed from the data.

2020年8月20日，编号为B1至B3的三个探空气球从埃斯兰厄空间中心（ESRANGE Space Center，地理坐标67.89°N，21.08°E）发射升空。该气球搭载两套通过100米系绳分隔的有效载荷舱。每个有效载荷舱内均配置一套DiGOS DATA-CUBE数据采集单元，以400Hz的采样率同步记录三台InfraBSU次声微压计的监测数据。其中一台微压计采集声学信号的真实极性数据，另一台采集极性反转后的信号；第三台麦克风的两个端口均加装气流滤波器，可阻断声波被该设备捕获。本数据集整合了第一台与第二台微压计的采集数据。通过从真实极性数据中减去极性反转数据，可保留完整的声学信号，同时去除电磁干扰、机械振动等非声学噪声源引入的干扰噪声。