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，3个编号为B1至B3的气球从埃斯兰厄航天中心（ESRANGE Space Center，北纬67.89°，东经21.08°）发射升空。该系列气球搭载两个有效载荷舱，二者通过100米长的系绳相连。每个有效载荷舱内均装有一台DiGOS DATA-CUBE数据采集设备，以400 Hz的采样率记录三台InfraBSU次声微气压计（InfraBSU infrasound microbarometers）的数据。其中一台微气压计用于采集声学信号的原始极性数据，另一台采集极性反转后的信号数据；第三台麦克风的两个端口均加装了流量滤波器，可阻止声波被该设备记录。本数据集整合了第一台与第二台微气压计的采集数据。通过将极性反转后的数据集与原始极性数据集相减，可保留完整的声学信号，同时去除电磁干扰、振动等非声学噪声源引入的数据干扰。