根据 VLF 和 ELF 电磁场测量结果调查 2022 年 1 月 15 日汤加火山爆发期间的异常闪电活动

IF 1.8 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
Alexander Shvets , Yasuhide Hobara , Masashi Hayakawa , Alisa Shvets , Oleksandr Koloskov , Yury Yampolsky
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引用次数: 0

摘要

2022 年 1 月 15 日汤加火山爆发期间,在距离火山约 8870 公里的 Akademik Vernadsky 站(南纬 65.246°;西经 64.257°)发现甚低频(VLF,3-30 kHz)和极低频(ELF,3-3000 Hz)无线电噪声水平和甚低频大气速率异常增加。在世界标准时间 5 时左右的活动高峰期,2 分钟间隔内的大气数据数量比火山爆发前增加了近 15 倍。此时,估计速率达到每秒 360 个甚低频大气压。同时,在 ELF 和 VLF 范围内观察到磁场功率谱密度增加了 5-9 倍。40 分钟后,仅在 ELF 范围内观察到一个持续 10 分钟的增大峰值,其大小与主峰值相当。根据全球闪电定位网络(WWLLN)的数据,在此期间,增加的雷暴活动主要集中在火山附近。ELF 和 VLF 辐射强度之间的这种差异表明,火山喷口地区和火山灰羽流地区发生的雷电放电中的电流参数存在显著差异。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Investigation of anomalous lightning activity during the January 15, 2022 Tonga volcano eruption based on measurements of the VLF and ELF electromagnetic fields

An anomalous increase in the level of Very Low Frequency (VLF, 3–30 kHz) and Extremely Low Frequency (ELF, 3–3000 Hz) radio noise and the rate of VLF atmospherics was registered during the explosive eruption of the Tonga volcano on January 15, 2022 at the Akademik Vernadsky station (65.246°S; 64.257°W) about 8870 km from the volcano. At the peak activity around 5 UT, the number of atmospherics in 2-min intervals increased by almost 15 times compared to the period preceding the eruption. At this point, the estimated rate reached 360 VLF atmospherics per second. At the same time, an increase in the power spectral density of the magnetic field by 5–9 times was observed in both the ELF and VLF ranges. After 40 min, only on ELF an increased peak lasting ∼10 min was observed, comparable in magnitude to the main peak. According to the Worldwide Lightning Location Network (WWLLN), increased thunderstorm activity was concentrated very close to the volcano during this period. This discrepancy between the intensities of ELF and VLF radiation suggests a significant difference in the parameters of currents in lightning discharges occurring in the area of the volcano vent and in the area of the volcanic ash plume.

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来源期刊
Journal of Atmospheric and Solar-Terrestrial Physics
Journal of Atmospheric and Solar-Terrestrial Physics 地学-地球化学与地球物理
CiteScore
4.10
自引率
5.30%
发文量
95
审稿时长
6 months
期刊介绍: The Journal of Atmospheric and Solar-Terrestrial Physics (JASTP) is an international journal concerned with the inter-disciplinary science of the Earth''s atmospheric and space environment, especially the highly varied and highly variable physical phenomena that occur in this natural laboratory and the processes that couple them. The journal covers the physical processes operating in the troposphere, stratosphere, mesosphere, thermosphere, ionosphere, magnetosphere, the Sun, interplanetary medium, and heliosphere. Phenomena occurring in other "spheres", solar influences on climate, and supporting laboratory measurements are also considered. The journal deals especially with the coupling between the different regions. Solar flares, coronal mass ejections, and other energetic events on the Sun create interesting and important perturbations in the near-Earth space environment. The physics of such "space weather" is central to the Journal of Atmospheric and Solar-Terrestrial Physics and the journal welcomes papers that lead in the direction of a predictive understanding of the coupled system. Regarding the upper atmosphere, the subjects of aeronomy, geomagnetism and geoelectricity, auroral phenomena, radio wave propagation, and plasma instabilities, are examples within the broad field of solar-terrestrial physics which emphasise the energy exchange between the solar wind, the magnetospheric and ionospheric plasmas, and the neutral gas. In the lower atmosphere, topics covered range from mesoscale to global scale dynamics, to atmospheric electricity, lightning and its effects, and to anthropogenic changes.
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