Parameters of the infrasonic signal generated by the Kamchatka meteoroid
| 1Chernogor, LF, 2Liashchuk, OI, 1Shevelev, MB 1V.N. Karazin Kharkiv National University, Kharkiv, Ukraine 2Main Center of Special Monitoring, Gorodok, Ukraine |
| Kinemat. fiz. nebesnyh tel (Online) 2020, 36(5):31-54 |
| https://doi.org/10.15407/kfnt2020.05.031 |
| Start Page: Dynamics and Physics of Bodies of the Solar System |
| Language: Ukrainian |
Abstract: The subject of this study is the infrasonic signal generated by a high-speed (32 km/s), high-energy (173 kt TNT), and large-sized (9.4 m) celestial body, later called the Kamchatka meteoroid, which entered the terrestrial atmosphere and exploded on 18 December 2018. The object of the study is the parameters of the infrasonic signal launched by the Kamchatka meteoroid. The study is based on the data on temporal dependences of pressure in the infrasonic wave collected by the I53US, I30JP, I59US, I46RU, I57US, and MAAG2 infrasonic stations included in the International Monitoring System (IMS) set up by Comprehensive Nuclear-Test-Ban Treaty Organization’s International Monitoring System (CTBTO). The measurement data initially recorded on a relative scale have been converted into absolute values. Then, the temporal dependences of infrasonic wave pressure underwent filtering in the 1...40-s period range, and subsequently, were subjected to the system spectral analysis that includes the mutually complementary short-time Fourier transform, the Fourier transform in a sliding window with a width adjusted to be equal to a fixed number of harmonic periods, and the wavelet transform with the Morlet wavelet used as the basis function. In the research results we obtained that infrasonic signal amplitude exhibits a quite rapid decrease with distance from an infrasonic station to the meteoroid explosion point. The time delay of the infrasonic signal shows an increase with distance from the point of the celestial body explosion to the site of signal registration. The signal celerity exhibits a dependence on the distance and the path orientation, and it is estimated to be in the 269...308-m/s range. The infrasonic signal duration shows virtually no dependence on the distance from the detonation point to an infrasonic station. The infrasonic signal spectra exhibit a wide bandwidth, from ~ 5-s to ~ 40-s periods. At the same time, the greatest energy falls within the isolated period ranges of 12...15 s and 28...33 s. The scatter diagrams and regressions for infrasound main parameters was plotted. From infrasonic period the celestial body kinetic energy (179 kt TNT) and acoustic efficiency (~4 %) was estimated. |
| Keywords: fitted dependences, infrasonic signal, main parameters, meteoroid |
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