Variations of the Geomagnetic Field Accompanying the Fall of the Kyiv Meteoroid

IF 0.5 4区物理与天体物理 Q4 ASTRONOMY & ASTROPHYSICS Kinematics and Physics of Celestial Bodies Pub Date : 2024-06-17 DOI:10.3103/s0884591324030036

L. F. Chernogor, M. B. Shevelev, N. M. Tilichenko

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Abstract—

The theoretical and experimental study of the geomagnetic effect of cosmic bodies remains an urgent problem. This is especially true for meter-sized meteoroids, for which the very existence of the magnetic effect remains in question. The purpose of this article is to present the results of the analysis of temporal variations of the X-, Y-, and Z-components of the geomagnetic field detected by the International Real-time Magnetic Observatory Network (INTERMAGNET) on the day of the Kyiv meteoroid fall and on reference days. The analysis of temporal variations has shown that the levels of these components on the day of the cosmic body explosion and on reference days were significantly different. The level of X-component with a 6 min delay decreased by 2…5 nT, which lasted approximately 60 min. With a delay of 25 min and a duration of 25 min, a quasi-periodic disturbance was observed with a variable period within 4…12 min and an amplitude increasing from 0.3…0.4 to 1.2…1.5 nT. The first disturbance, which had a speed of approximately 300 m/s, could have been caused by a blast wave. The second disturbance was most likely associated with the generation and oblique propagation of an atmospheric gravity wave with a speed of hundreds of meters per second. Within the ionosphere, the disturbance propagated at a speed of approximately 660 km/s by means of magnetohydrodynamic waves. The temporal variations of the Y- and Z-components on the day of the explosion fluctuated for 60 min and decreased by 5…10 nT. The mechanism of long-lasting disturbances of these components remains unknown. It is likely that it could be related to the diamagnetic effect. There are reasons to believe that meter-sized cosmic bodies can cause the detected magnetic effect.

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伴随基辅流星体坠落的地磁场变化

摘要--对宇宙天体地磁效应的理论和实验研究仍然是一个亟待解决的问题。对于米级流星体来说尤其如此，因为它们的磁效应是否存在仍然是个问题。本文的目的是介绍国际实时磁观测网络（INTERMAGNET）在基辅流星体坠落当日和参考日探测到的地磁场 X、Y 和 Z 分量的时间变化分析结果。对时间变化的分析表明，这些分量在宇宙天体爆炸当日和参考日的水平有显著差异。在延迟 6 分钟的情况下，X 分量的水平下降了 2...5 nT，大约持续了 60 分钟。在延迟 25 分钟和持续 25 分钟的情况下，观测到一个准周期性扰动，周期在 4...12 分钟内可变，振幅从 0.3...0.4 nT 增加到 1.2...1.5 nT。第一个扰动的速度约为 300 米/秒，可能是由爆炸波引起的。第二个扰动很可能与大气重力波的产生和斜向传播有关，其速度为每秒数百米。在电离层内，扰动通过磁流体动力波以每秒约 660 千米的速度传播。爆炸当天，Y-和 Z-分量的时间变化波动了 60 分钟，降低了 5...10 nT。这些分量的长期扰动机制尚不清楚。很可能与二磁效应有关。有理由相信，一米大小的宇宙天体可能会造成所探测到的磁效应。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Kinematics and Physics of Celestial Bodies ASTRONOMY & ASTROPHYSICS-

CiteScore

0.90

自引率

40.00%

发文量

审稿时长

>12 weeks

期刊介绍： Kinematics and Physics of Celestial Bodies is an international peer reviewed journal that publishes original regular and review papers on positional and theoretical astronomy, Earth’s rotation and geodynamics, dynamics and physics of bodies of the Solar System, solar physics, physics of stars and interstellar medium, structure and dynamics of the Galaxy, extragalactic astronomy, atmospheric optics and astronomical climate, instruments and devices, and mathematical processing of astronomical information. The journal welcomes manuscripts from all countries in the English or Russian language.