2000-2020 年期间整个南亚地区地磁震荡的比较研究

IF 2.8 3区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Geophysical Journal International Pub Date : 2024-08-01 DOI:10.1093/gji/ggae264

A E Nel, P B Kotzé

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引用次数: 0

摘要

摘要对南大西洋异常区内和邻近的六个磁场观测站的地磁场数据进行了逐一分析，以探测在不到一年的时间尺度内发生的突然的世俗变化，并探讨与南大西洋异常区演变的任何相关性。通过 CHAOS-7 模型应用外部磁场修正后，2000-2020 年期间各观测站月平均东向分量 Y 的 12 个月差值显示了几个振幅不同的地磁抽动的证据。这些观测结果与 CHAOS-7 球谐波模型和以前对南大西洋异常演变的研究结果进行了比较。这项研究表明，CHAOS 等全球磁场模型在确定地磁场的局部快速变化方面并不十分有效，这突出了在研究地磁突变时将观测数据与卫星数据结合使用的重要性。

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A comparative investigation of geomagnetic jerks across the SAA during the period 2000-2020

Summary Geomagnetic field data from six magnetic observatories in and adjacent to the South Atlantic Anomaly were individually analysed to detect abrupt secular variation changes occurring on time scales of less than a year and to explore any correlation with the evolution of the South Atlantic Anomaly. After applying external field corrections by means of the CHAOS-7 model, twelve-month differences of the respective observatory monthly mean of the eastward component Y revealed evidence of several geomagnetic jerks with varying amplitudes during the period 2000-2020. These observations were compared to the CHAOS-7 spherical harmonic model and previous studies of the South Atlantic Anomaly’s evolution. It emerged from this study that global field models like CHAOS are not very effective in identifying rapid localised changes in the geomagnetic field, highlighting the importance of using observatory data in conjunction with satellite data when studying geomagnetic jerks.

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来源期刊

Geophysical Journal International 地学-地球化学与地球物理

CiteScore

5.40

自引率

10.70%

发文量

436

审稿时长

3.3 months

期刊介绍： Geophysical Journal International publishes top quality research papers, express letters, invited review papers and book reviews on all aspects of theoretical, computational, applied and observational geophysics.