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Characteristics of Infrasonic Signals Generated by the Lipetsk Meteoroid: Statistical Analysis
Kinematics and Physics of Celestial Bodies ( IF 0.5 ) Pub Date : 2020-08-31 , DOI: 10.3103/s0884591320040030
L. F. Chernogor , M. B. Shevelev

Abstract

The purpose of this paper is to construct basic correlation diagrams and plot the respective regression functions for the parameters of the infrasonic signals launched by the Lipetsk meteoroid. The celestial body that entered the Earth’s atmosphere at 01:16:20 UT on June 21, 2018, had the following initial parameters: 14.4 km/s speed, approximately 113 t mass, approximately 4 m size, and approximately 2.8 kt TNT kinetic energy. The infrasonic signals generated by the celestial body were observed on a global scale, and they were recorded by the International Monitoring System (IMS) set up by the Comprehensive Nuclear-Test-Ban Treaty Organization’s International Monitoring System (CTBTO). For data processing, techniques of mathematical statistics have been invoked. The basic results of the study are as follows. The infrasonic signal exhibits a linear dependence of the infrasonic signal time delay on the horizontal distance from the meteoroid explosion epicenter, and the signal celerity averaged over all propagation paths is estimated to be approximately 304–305 m/s. The infrasonic signal celerity first shows a rapid enough decrease with distance, but over the 4.5–8.66-Mm distance range exhibits fluctuations at approximately 302 m/s. The duration of the infrasonic signal shows a linear decrease with distance, and the signal duration dispersion is insignificant in the 5–8 Mm distance range. The mean periods of the infrasonic signal, independent of distance and averaged over various regression functions, are estimated to be 6.28 ± 0.98 s and 6.14 ± 0.76 s. The mean of the initial kinetic energy estimated using the oscillation period of the infrasonic signal is 2.26–2.43 kt TNT, which differs insignificantly from the NASA estimates (2.8 kt TNT). The approximation for the dependence of celerity versus sine of the back-azimuth angle of arrival shows that the corrected value of the celerity is approximately 300 m/s, and the mean of the troposphere-stratosphere wind is approximately 25–31 m/s. Analysis of the correlation diagrams has shown that a steady statistical link exists between the true and observed back-azimuth angles of infrasound sources. It is noted that the level of fluctuations in the azimuth tends to increase with distance.


中文翻译:

Lipetsk流星体产生的次声信号的特征:统计分析

摘要

本文的目的是构建基本的相关图,并绘制由利佩茨克流星体发射的次声信号参数的各自回归函数。在2018年6月21日美国时间01:16:20进入地球大气层的天体具有以下初始参数:14.4 km / s的速度,大约113 t的质量,大约4 m的大小以及大约2.8 kt TNT动能。在全球范围内观测了天体产生的次声信号,并由全面禁止核试验条约组织的国际监测系统(CTBTO)建立的国际监测系统(IMS)进行了记录。对于数据处理,已经调用了数学统计技术。研究的基本结果如下。次声信号表现出次声信号时间延迟与流星体爆炸震中水平距离的线性关系,在所有传播路径上平均的信号速度估计约为304-305 m / s。次声信号的速度首先显示出随着距离的迅速降低,但是在4.5–8.66-Mm的距离范围内,波动幅度约为302 m / s。次声信号的持续时间随距离呈线性下降,并且在5–8 Mm的距离范围内,信号持续时间的弥散无关紧要。次声信号的平均周期与距离无关,并且在各种回归函数中平均,估计为6.28±0.98 s和6.14±0.76 s。使用次声信号的振荡周期估算的初始动能平均值为2.26–2.43 kt TNT,与NASA估算值(2.8 kt TNT)相差不大。速度对后向方位角正弦关系的近似表明,该速度的校正值约为300 m / s,对流层-平流层风的平均值约为25-31 m / s。对相关图的分析表明,次声源的真实和观察到的后方位角之间存在稳定的统计联系。注意,方位的波动水平趋于随距离增加。速度对后向方位角正弦关系的近似表明,该速度的校正值约为300 m / s,对流层-平流层风的平均值约为25-31 m / s。对相关图的分析表明,次声源的真实和观察到的后方位角之间存在稳定的统计联系。注意,方位的波动水平趋于随距离增加。速度对后向方位角正弦关系的近似表明,该速度的校正值约为300 m / s,对流层-平流层风的平均值约为25-31 m / s。对相关图的分析表明,次声源的真实和观察到的后方位角之间存在稳定的统计联系。注意,方位的波动水平趋于随距离增加。
更新日期:2020-08-31
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