Ionospheric response to the 08 April 2024 total solar eclipse over United States: a case study

IF 1.8 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS Astrophysics and Space Science Pub Date : 2024-10-24 DOI:10.1007/s10509-024-04372-w
Sujan Prasad Gautam, Atirsaw Muluye Tilahun, Ashok Silwal, Binod Adhikari, Yohannes Getachew Ejigu
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Abstract

A total solar eclipse occurred on April 8, 2024, across the United States, with obscuration rates ranging from 20–100% at different locations. We study the ionospheric Total Electron Content (TEC) response to the eclipse using data from 51 ground-based GPS stations. We find a significant depletion in TEC of up to 65%, with larger depletion rates occurring along the path of totality. We also observe a time delay between the maximum TEC depletion and the time of maximum obscuration, ranging from 8 to 80 minutes, with longer delays occurring at stations with lower obscuration rates. Both time delay and TEC depletion rates are found to vary with latitude, with slightly longer delays at lower latitudes and higher TEC depletion rates at mid-latitudes. The TEC depletion rate also increased with local time, showing a higher decrement after noon compared to before. The spatiotemporal variation in TEC closely followed the eclipse’s path, indicating a positive correlation with the movement of the moon’s shadow. Monitoring rate of TEC change during such rare events is crucial for enhancing our understanding of ionospheric dynamics, which can be very helpful to improve the accuracy of global communication and navigation systems.

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电离层对 2024 年 4 月 8 日美国上空日全食的响应:案例研究
2024 年 4 月 8 日,美国各地发生了日全食,不同地点的遮蔽率从 20% 到 100% 不等。我们利用 51 个地面 GPS 站的数据研究了电离层电子总含量(TEC)对日全食的响应。我们发现电离层电子总含量(TEC)有明显下降,最高可达 65%,全食路径沿线的下降率更大。我们还观察到最大 TEC 损耗时间与最大遮挡时间之间存在时间延迟,从 8 分钟到 80 分钟不等,遮挡率较低的站点出现的时间延迟更长。时间延迟和 TEC 耗损率都随纬度的变化而变化,低纬度地区的时间延迟稍长,而中纬度地区的 TEC 耗损率较高。TEC 耗损率也随当地时间的变化而增加,正午之后的耗损率比正午之前要高。熱釋光的時空變化緊貼月食的路徑,顯示與月影的移動呈正相關。在这种罕见事件中监测 TEC 的变化率对加强我们对电离层动态的了解至关重要,这对提高全球通信和导航系统的准确性非常有帮助。
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来源期刊
Astrophysics and Space Science
Astrophysics and Space Science 地学天文-天文与天体物理
CiteScore
3.40
自引率
5.30%
发文量
106
审稿时长
2-4 weeks
期刊介绍: Astrophysics and Space Science publishes original contributions and invited reviews covering the entire range of astronomy, astrophysics, astrophysical cosmology, planetary and space science and the astrophysical aspects of astrobiology. This includes both observational and theoretical research, the techniques of astronomical instrumentation and data analysis and astronomical space instrumentation. We particularly welcome papers in the general fields of high-energy astrophysics, astrophysical and astrochemical studies of the interstellar medium including star formation, planetary astrophysics, the formation and evolution of galaxies and the evolution of large scale structure in the Universe. Papers in mathematical physics or in general relativity which do not establish clear astrophysical applications will no longer be considered. The journal also publishes topically selected special issues in research fields of particular scientific interest. These consist of both invited reviews and original research papers. Conference proceedings will not be considered. All papers published in the journal are subject to thorough and strict peer-reviewing. Astrophysics and Space Science features short publication times after acceptance and colour printing free of charge.
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