The statistical analysis of infrasonic parameters generated by the Chelyabinsk meteoroid

Heading: 
Dynamics and Physics of Solar System Bodies
1Chernogor, LF
1V.N. Karazin Kharkiv National University, Kharkiv, Ukraine
Kinemat. fiz. nebesnyh tel (Online) 2020, 36(4):35-57
https://doi.org/10.15407/kfnt2020.04.035
Start Page: Dynamics and Physics of Solar System Bodies
Language: Ukrainian
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 Chelyabinsk meteoroid 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 correlation 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) 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 Eurasia geophysical observatories. The correlation 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. Averaged over all propagation paths, estimates of the celerity (approximately 280 m/s) and tropospheric-stratospheric wind (about 30 m/s) have been determined. The advantages and disadvantages of the regression lines proposed are discussed.

Keywords: azimuth, celerity, correlation diagram, infrasonic signal, regression line, signal amplitude, signal duration, signal period per cycle, signal-to-noise ratio, time lag

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