The 2021 Antarctic Total Eclipse: Ground Magnetometer and GNSS Wave Observations From the 40 Degree Magnetic Meridian
The 2021 Antarctic Total Eclipse: Ground Magnetometer and GNSS Wave Observations From the 40 Degree Magnetic Meridian
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DOI：
10.1029/2022ja031142
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发表时间：
2023-02
期刊：
影响因子：
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通讯作者：
S. Coyle;M. Hartinger;C. Clauer;J. Baker;I. Cnossen;M. Freeman;J. Weygand
中科院分区：
文献类型：
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作者：
S. Coyle;M. Hartinger;C. Clauer;J. Baker;I. Cnossen;M. Freeman;J. Weygand
2021年12月4日，南极洲西部发生日全食。大约一小时前，在北方半球观测到了地磁亚暴的爆发。建议通过减少光电离来改变电离层的电导率结构，从而影响磁层-电离层（MI）耦合动力学。电导率的这种突然和戏剧性的变化不仅可能改变全球MI耦合，但它也可能引入各种局部的不稳定性，出现在两个半球。基于全球导航卫星系统（GNSS）的2021年12月日食期间南部高纬度电离层总电子含量（TEC）的观测显示，波活动的迹象与日食峰值总体一致。在同一地区的地面磁观测显示出类似的活动，我们的分析表明，这些观测结果是由于“日食效应”，而不是以前的亚暴。我们提出了第一个多点的半球间研究南极全食与当地TEC观测背景，以支持这一结论。
On 04 December 2021, a total solar eclipse occurred over west Antarctica. Nearly an hour beforehand, a geomagnetic substorm onset was observed in the northern hemisphere. Eclipses are suggested to influence magnetosphere‐ionosphere (MI) coupling dynamics by altering the conductivity structure of the ionosphere by reducing photoionization. This sudden and dramatic change in conductivity is not only likely to alter global MI coupling, but it may also introduce a variety of localized instabilities that appear in both hemispheres. Global navigation satellite system (GNSS) based observations of the total electron content (TEC) in the southern high latitude ionosphere during the December 2021 eclipse show signs of wave activity coincident with the eclipse peak totality. Ground magnetic observations in the same region show similar activity, and our analysis suggest that these observations are due to an “eclipse effect” rather than the prior substorm. We present the first multi‐point interhemispheric study of a total south polar eclipse with local TEC observational context in support of this conclusion.