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Telecommunications and Radio Engineering
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ISSN Imprimer: 0040-2508
ISSN En ligne: 1943-6009

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Telecommunications and Radio Engineering

DOI: 10.1615/TelecomRadEng.v73.i12.60
pages 1105-1115

LARGE−SCALE DISTURBANCES IN THE EARTH'S MAGNETIC FIELD ASSOCIATED WITH THE CHELYABINSK METEORITE EVENT

L. F. Chernogor
V. Karazin National University of Kharkov, 4, Svoboda Sq., Kharkov, 61077; A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura St., Kharkov 61085, Ukraine

RÉSUMÉ

Variations in the geomagnetic field components acquired during the Chelyabinsk meteorite event on February 15, 2013 and on reference days (February 12, 2013 and February 16, 2013) have been analyzed. The magnetometers chosen for study are located at Novosibirsk City, Alma-Ata City, Kyiv City, and Lviv City. The distance between the site of the meteor blast and a magnetometer varies from 1.200 km to 2.700 km. The passage and explosion of the Chelyabinsk meteor observed to be associated with the variations mainly in the horizontal component of the geomagnetic field. The magnetic field varied quasi-periodically with 30...40-min periods and 0.5...2-nT amplitudes for distances of 2.700...1.200 km, respectively, and with 2...3-hr durations. The horizontal velocity of the wave disturbances propagation was approximately equal to 260...370 m s−1. A theoretical model of the wave disturbances has been developed. The model suggests that the geomagnetic field disturbances are caused by the acoustic gravity wave generated in the atmosphere by the falling meteoroid and associated with them traveling ionospheric disturbances. The calculated magnitudes of the wave disturbances are equal to 0.6...1.8 nT at distances of 2.700...1.200 km, respectively. The observations and the estimates are in good agreement.


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