Physical effects of Kyiv meteoroid. 3
Heading:
| 1Chernogor, LF 1V.N. Karazin Kharkiv National University, Kharkiv, Ukraine |
| Kinemat. fiz. nebesnyh tel (Online) 2024, 40(1):38-64 |
| https://doi.org/10.15407/kfnt2024.01.038 |
| Language: Ukrainian |
Abstract: Comprehensive modeling studies of a number of main processes induced in all geospheres by the fall and explosion of the Kyiv meteoroid at 19 April 2023 have been conducted. Magnetic, electric, electromagnetic, ionospheric, and seismic effects, the effects of acoustic-gravity waves have been estimated. The magnetic effect of the ionospheric currents and the current in the wake of the meteoroid could be substantial (~0.4…0.7 nT). Due to the accumulation of electrons in the atmospheric gravity wave field, the magnetic effect could reach the order of 0.6…6 nT. Under the action of an external electric field, a transient current pulse with the current density up to ~102…103 A could occur. The electrostatic effect could be accompanied by the accumulation of an electric charge of ~1…6 mC producing the electric field intensity of ~10 MV/m. The flow of the electric current in the wake of the meteoroid could result in the generation of an electromagnetic pulse in the ~10…100 kHz band with the electric field intensity of ~1…10 V/m. The electromagnetic effect of infrasound has been determined to be significant (~0.6…6 V/m and ~2…20 nT). The absorption of the shock wave at ionospheric dynamo region altitudes (~100…150 km) could generate secondary atmospheric gravity waves with the ~0.1 % relative amplitude. The fall of the meteoroid acted to produce a plasma wake not only in the lower but also in the upper atmosphere in the range no less than 1000 km. The possibility of appearance of electrophonic effect was improbable. The possibilities of appearing the generation of the ion and magnetic sound by infrasound, as well as the generation of gradient-drift and drift-dissipative instabilities seems unlikely. A magnetic, electric, and electromagnetic effects dealt with in this paper partially fill up gaps in the theory of physical effects produced by meteoroids in the Earth — atmosphere — ionosphere — magnetosphere system. The magnitudes of magnetic, electric, electromagnetic, ionospheric, and acoustic effects were significant. The magnitude of the earthquake caused by the meteoroid explosion did not exceeded 1. The mean rate of the fall of celestial bodies similar to the Kyiv meteoroid is equal to 32.3 yr–1, i.e., one event in 11 days. |
| Keywords: acoustic and atmospheric gravity waves, acoustic effects, comprehensive simulation, electric effects, electromagnetic effects, ionospheric effects, Kyiv meteoroid, magnetic effects, plasma wake, seismic effects |
References:
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