Prediction of the thermospheric and ionospheric responses to the 21 June 2020 annular solar eclipse

Prediction of the thermospheric and ionospheric responses to the 21 June 2020 annular solar eclipse
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2020 年 6 月 21 日日环食的热层和电离层响应预测

DOI:
10.26464/epp2020032
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发表时间:
2020-05
影响因子:
2.9
通讯作者:
Huang Fuqing
Huang Fuqing
中科院分区:
地球科学4区
文献类型:
--
作者:
Dang Tong;Lei Jiuhou;Wang Wenbin;Yan Maodong;Ren Dexin;Huang Fuqing

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2020年6月21日,日环食将穿越从非洲到东南亚的低纬度地区。日食最大遮蔽的最高纬度约为30°。这次低纬度日食为探索日食对低纬度电离层-热层(I-T)系统,特别是赤道电离异常区的影响提供了一个独特和前所未有的机会。在这项研究中,我们描述了一个定量预测的影响,即将到来的日食上的I-T系统使用热层电离层电动力学大气环流模式模拟。一个突出的总电子含量(TEC)的增强约2 TEC单位发生在赤道电离异常区,即使这个地区仍然是在日食的阴影。这种TEC增强持续近4.5小时,在日食结束后很久。进一步的模式控制模拟表明,TEC的增加主要是由日食引起的跨赤道等离子体输送与北向中性风扰动,这是由日食引起的压力梯度变化的结果。结果表明,日食对I-T系统的影响不是瞬时的和线性的,而是一个动力学和能量耦合的系统。
On 21 June 2020, an annular solar eclipse will traverse the low latitudes from Africa to Southeast Asia. The highest latitude of the maximum eclipse obscuration is approximately 30°. This low-latitude solar eclipse provides a unique and unprecedented opportunity to explore the impact of the eclipse on the low-latitude ionosphere–thermosphere (I–T) system, especially in the equatorial ionization anomaly region. In this study, we describe a quantitative prediction of the impact of this upcoming solar eclipse on the I–T system by using Thermosphere–Ionosphere–Electrodynamics General Circulation Model simulations. A prominent total electron content (TEC) enhancement of around 2 TEC units occurs in the equatorial ionization anomaly region even when this region is still in the shadow of the eclipse. This TEC enhancement lasts for nearly 4.5 hours, long after the solar eclipse has ended. Further model control simulations indicate that the TEC increase is mainly caused by the eclipse-induced transequatorial plasma transport associated with northward neutral wind perturbations, which result from eclipse-induced pressure gradient changes. The results illustrate that the effect of the solar eclipse on the I–T system is not transient and linear but should be considered a dynamically and energetically coupled system.
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