Traveling ionospheric disturbances in the Weddell Sea Anomaly associated with geomagnetic activity

Traveling ionospheric disturbances in the Weddell Sea Anomaly associated with geomagnetic activity
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威德尔海中的移动电离层扰动与地磁活动相关的异常

DOI:
10.1002/jgra.50566
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发表时间:
2013
期刊:
Space Physics
影响因子:
--
通讯作者:
Milan S
Milan S
中科院分区:
--
文献类型:
--
作者:
Milan S

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我们目前的观测从福克兰群岛超双极光雷达网络雷达的高频无线电波的传播通过威德尔海电离层异常(WSA),一个区域的增强南太平洋地区的夏季夜间电离层电子密度覆盖南太平洋和南美洲地区。这种异常现象被认为是由盛行的向赤道的热层风抬升电离层造成的。特别令人感兴趣的是WSA支持的传播的扰动,这表明在地磁扰动期间,电离层可以降低数十公里,随后在1至2小时内恢复。扰动可以单独出现,也可以作为一系列两到三个事件出现。我们讨论了扰动的可能原因,并得出结论,它们与极光或极光下电离层中磁层能量沉积产生的向赤道传播的大尺度大气波有关。地磁暴期间高/中纬度电动力学的变化也可以解释这种扰动,但需要进一步的模拟才能完全理解其原因。
We present observations from the Falkland Islands Super Dual Auroral Radar Network radar of the propagation of HF radio waves via the Weddell Sea Ionospheric Anomaly (WSA), a region of enhanced austral summer nighttime ionospheric electron densities covering the southern Pacific and South Americas region. This anomaly is thought to be produced by uplift of the ionosphere by prevailing equatorward thermospheric winds. Of particular interest are perturbations of the WSA‐supported propagation, which suggest that during periods of geomagnetic disturbance, the ionospheric layer can be lowered by several tens of kilometers and subsequently recover over a period of 1 to 2 h. Perturbations can appear singly or as a train of two to three events. We discuss possible causes of the perturbations and conclude that they are associated with equatorward propagating large‐scale atmospheric waves produced by magnetospheric energy deposition in the auroral or subauroral ionosphere. Changes in high/middle latitude electrodynamics during geomagnetic storms may also account for the perturbations, but further modeling is required to fully understand their cause.
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