The physical effects of Lipetsk meteoroid. 1
| 1Chernogor, LF 1V.N. Karazin Kharkiv National University, Kharkiv, Ukraine |
| Kinemat. fiz. nebesnyh tel (Online) 2019, 35(4):37-59 |
| https://doi.org/10.15407/kfnt2019.04.037 |
| Start Page: Dynamics and Physics of Solar System Bodies |
| Language: Russian |
Abstract: This study aims at estimating a few physical effects associated with the passage via the atmosphere and airburst of the Lipetsk meteoroid (Russia) on June 21, 2018. The initial kinetic energy of the meteoroid was equal to approximately 11.7 TJ or 2.8 kt TNT. About 10.4 % or 1.22 TJ of the initial kinetic energy of the celestial body transformed into a flare. The meteoroid was found to be stony with the matter density of 3.3 t/m3. The celestial body moved along the trajectory inclined at angle of approximately 79° to the horizon. The initial mass of the body was equal to about 113 t, its initial speed 14.4 km/s, and the initial diameter 4 m. The altitude of the Lipetsk meteoroid explosion was about 27 km, and the explosion length approximately 3.75 km. Comprehensive modeling of the processes launched by the meteoroid passage through all geospheres has been performed. Mechanical, optical, and gas-dynamic effects associated with the passage of the Lipetsk meteoroid. The main release of energy (1013 J) is shown to occur at approximately 25...27 km altitude where the rate of mass loss attains approximately 130...140 t/s, the deceleration about 21 km/s2. In the vicinity of the meteoroid explosion, the meteoroid speed decreased by about 12 %, and its mass by approximately 16 %. The main parameters of shock wave have been estimated. The shock wave energy and power are equal to approximately 10 TJ and 0.8 TW, respectively. At the epicenter of the meteoroid explosion, the pressure at the shock reached ≈140 Pa. This turns out not to be enough for causing building destruction. The energy and optical radiation power were equal to 1.22 TJ and 2...3 TW, respectively. The flare energy was by 6 orders of magnitude less than that needed for causing ignition of materials and fires in epicenter region. The relative disturbances in air pressure at ionospheric heights above the explosion epicenter attained tens or even hundreds per cents. |
| Keywords: complex simulation, gas-dynamical effects, mechanical effects, meteoroid, optical effects |
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