Statistical Analysis of Infrasonic Parameters Generated by the Chelyabinsk Meteoroid
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AMICS AND PHYSICS OF BODIES OF THE SOLAR SYSTEM
Statistical Analysis of Infrasonic Parameters Generated by the Chelyabinsk Meteoroid L. F. Chernogor* Karazin Kharkiv National University, Kharkiv, 61022 Ukraine *e-mail: [email protected] Received August 1, 2019; revised August 1, 2019; accepted April 13, 2020
Abstract—The passage of the Chelyabinsk meteoroid generated a wide variety of physical effects in all subsystems in the Earth–atmosphere–ionosphere–magnetosphere system. Earlier studies have been conducted in order to examine the Chelyabinsk meteoroid’s effects in the atmosphere, ionosphere, and the geomagnetic field. Particular attention has been given to the features of the infrasound signal generated by the Chelyabinsk meteoroid. At the same time, the results of the statistical analysis of infrasonic parameters are absent in the literature. The purpose of this paper is to construct scatter diagrams for basic infrasonic parameters of the signal propagating globally (such as signal-to-noise ratios, time lags, celerity, time durations, amplitudes, and periods per cycle) depending on either the distance between the infrasound source and the sensor or the source back-azimuth as well as to fit respective regression lines. The data have been retrieved from 15 infrasound stations of the International Monitoring System (IMS) set up by the Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO). On individual occasions, these data have been complemented by the data acquired by the infrasound stations located at the Eurasian geophysical observatories. Scatter diagrams have been constructed for basic parameters of the infrasonic signal propagating globally. The estimated regression lines superimposed on the scatter diagrams of these parameters versus distance or back-azimuth are shown. Estimates of the infrasound signal celerity (approximately 280 m/s) and tropospheric and stratospheric wind speed (approximately 30 m/s) averaged over all propagation paths have been determined. The advantages and disadvantages of the proposed regression lines are discussed. Keywords: infrasonic signal, scatter diagram, signal-to-noise ratio, time delay, celerity, signal duration, signal amplitude, signal period per cycle, azimuth, regression line DOI: 10.3103/S0884591320040029
1. INTRODUCTION The fall and explosion of the Chelyabinsk meteoroid is an important astronomical and geophysical event, which is on par with the Tunguska body invading the Earth’s atmosphere. The effects of the Chelyabinsk meteoroid have been investigated in a large number of studies (see, e.g., [1–35, 37–41]). These studies present the results of observation and modeling of physical effects initiated by the passage of the Chelyabinsk meteoroid. The results of modeling the process of destruction of the cosmic body are described in [19, 20, 22, 38, 40, 42]. A systematic approach to the analysis of a large number of physical effects in the Earth–atmosphere–ionosphere–magnetosphere system is described in [18–20, 22, 35]. The effects of the gas–d
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