Monitoring the ionospheric conditions during the annular solar eclipse December 2019: A case study

IF 1.8 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Journal of Atmospheric and Solar-Terrestrial Physics Pub Date : 2024-06-01 DOI:10.1016/j.jastp.2024.106272

Siti Syukriah Khamdan , Tajul Ariffin Musa , Suhaila M. Buhari , Kornayat Hozumi , Neil Ashcroft , Nashriq Ferdaus Ahmad , Clara Yatini

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引用次数: 0

Abstract

This study investigates the ionospheric response to the December 26, 2019 annular solar eclipse over the southern tip of the Asia region, focusing on Malaysia, Sumatra, and Singapore. Utilizing data from GPS stations and ionosondes along the eclipse path, variations in Total Electron Content (TEC) and ionospheric foF2 parameters were analysed to assess the eclipse's impact. Results indicate a slight northward depletion of TEC, possibly linked to the Equatorial Ionization Anomaly (EIA), with up to −30% of depletions observed across all sites. Time delays in TEC and foF2 parameter responses suggest the influence of recombination and photochemical processes. Differences in depletion percentages between TEC and foF2 parameters may stem from production rate reductions during the eclipse. Post-sunset enhancements in TEC and foF2 parameters suggest the formation of ionospheric plasma blobs associated with Travelling Ionospheric Disturbances (TIDs) during the eclipse. While consistent with trends observed in prior studies, the study's findings highlight regional variations in ionospheric effects. This study enhances our understanding of ionospheric dynamics during solar eclipses and paves the way for further exploration in this area.

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2019 年 12 月日环食期间电离层状况监测：案例研究

本研究调查了电离层对 2019 年 12 月 26 日亚洲地区南端日环食的响应，重点是马来西亚、苏门答腊和新加坡。利用日食路径沿线全球定位系统站和电离层探测仪的数据，分析了电子总含量（TEC）和电离层 foF2 参数的变化，以评估日食的影响。结果表明，电子总含量（TEC）向北略有损耗，可能与赤道电离异常（EIA）有关，所有站点观测到的损耗高达-30%。TEC 和 foF2 参数响应的时间延迟表明受到了重组和光化学过程的影响。TEC和foF2参数耗损百分比的差异可能是由于日食期间生产率降低造成的。日落后 TEC 和 foF2 参数的增强表明日食期间形成了与电离层扰动（TID）相关的电离层等离子体团。研究结果与先前研究中观察到的趋势一致，但突出了电离层效应的区域差异。这项研究加深了我们对日食期间电离层动态的了解，并为这一领域的进一步探索铺平了道路。

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来源期刊

Journal of Atmospheric and Solar-Terrestrial Physics 地学-地球化学与地球物理

CiteScore

4.10

自引率

5.30%

发文量

审稿时长

6 months

期刊介绍： The Journal of Atmospheric and Solar-Terrestrial Physics (JASTP) is an international journal concerned with the inter-disciplinary science of the Earth''s atmospheric and space environment, especially the highly varied and highly variable physical phenomena that occur in this natural laboratory and the processes that couple them. The journal covers the physical processes operating in the troposphere, stratosphere, mesosphere, thermosphere, ionosphere, magnetosphere, the Sun, interplanetary medium, and heliosphere. Phenomena occurring in other "spheres", solar influences on climate, and supporting laboratory measurements are also considered. The journal deals especially with the coupling between the different regions. Solar flares, coronal mass ejections, and other energetic events on the Sun create interesting and important perturbations in the near-Earth space environment. The physics of such "space weather" is central to the Journal of Atmospheric and Solar-Terrestrial Physics and the journal welcomes papers that lead in the direction of a predictive understanding of the coupled system. Regarding the upper atmosphere, the subjects of aeronomy, geomagnetism and geoelectricity, auroral phenomena, radio wave propagation, and plasma instabilities, are examples within the broad field of solar-terrestrial physics which emphasise the energy exchange between the solar wind, the magnetospheric and ionospheric plasmas, and the neutral gas. In the lower atmosphere, topics covered range from mesoscale to global scale dynamics, to atmospheric electricity, lightning and its effects, and to anthropogenic changes.