Scholarlink

<p>For the first time, a statistical study has been conducted on the geomagnetic bay-like and quasi-periodic disturbances based on the datasets collected at 19 recording stations participating in INTERMAGNET Magnetic Observatories. In order to identify the disturbances from the volcanic explosion, a preliminary analysis has been used of the state of space weather during the catastrophic Tonga volcanic explosion of January 15, 2022. We summarize the main results as follows: The non-monotony of the variations in the strength of <i>Y</i> and <i>Z</i> geomagnetic field components increased appreciably on the day of the explosion as compared to the variations observed during the days used as a quiet time reference, while the eastward component of the geomagnetic field exhibited up to a 70 nT increase in variability. The duration and time delay of the bay-like disturbances increased with distance from the volcano, while their amplitude decreased. The propagation speeds of the bay-like disturbances at various observatories were determined to be in the 732–1325&#xa0;m/s range. Four groups of time delays of quasi-periodic disturbances have been identified in a simultaneous analysis for the first time; they correspond to the apparent speeds of a few hundred km/s, 287–378&#xa0;m/s, 212–233&#xa0;m/s, and 130&#xa0;m/s. The time delay in each group increased with distance away from the volcano. The agreement between theoretical estimates and the observational data testifies to the adequacy of the mechanism adopted for the generation of the disturbances.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Multi-site magnetometer observations of the magnetic disturbances due to the Tonga volcanic explosion of January 15, 2022: statistical analyses

  • 期刊论文

  • 发表日期：

    2026年5月1日

查看全文
  • Leonid F. Chernogor

摘要

For the first time, a statistical study has been conducted on the geomagnetic bay-like and quasi-periodic disturbances based on the datasets collected at 19 recording stations participating in INTERMAGNET Magnetic Observatories. In order to identify the disturbances from the volcanic explosion, a preliminary analysis has been used of the state of space weather during the catastrophic Tonga volcanic explosion of January 15, 2022. We summarize the main results as follows: The non-monotony of the variations in the strength of Y and Z geomagnetic field components increased appreciably on the day of the explosion as compared to the variations observed during the days used as a quiet time reference, while the eastward component of the geomagnetic field exhibited up to a 70 nT increase in variability. The duration and time delay of the bay-like disturbances increased with distance from the volcano, while their amplitude decreased. The propagation speeds of the bay-like disturbances at various observatories were determined to be in the 732–1325 m/s range. Four groups of time delays of quasi-periodic disturbances have been identified in a simultaneous analysis for the first time; they correspond to the apparent speeds of a few hundred km/s, 287–378 m/s, 212–233 m/s, and 130 m/s. The time delay in each group increased with distance away from the volcano. The agreement between theoretical estimates and the observational data testifies to the adequacy of the mechanism adopted for the generation of the disturbances.