Ionospheric effects during the total solar eclipse over South-East Asia-Pacific on 9 March 2016, Part 2: Total electron content reduction and fluctuation patterns

IF 1.8 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Journal of Atmospheric and Solar-Terrestrial Physics Pub Date : 2024-07-14 DOI:10.1016/j.jastp.2024.106295

Asnawi Husin , Jiyo Harjosuwito , Sefria Anggarani , Varuliantor Dear , Agri Faturahman , Rezy Pradipta

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引用次数: 0

Abstract

We report our observations and data analysis of ionospheric effects during the total solar eclipse over the South-East Asia-Pacific region on 9 March 2016. Here we present observations of spatio-temporal changes in the total electron content (TEC) distribution in the areas traversed by the eclipse. TEC reductions of 10-14 TECU were observed over the eastern part of Indonesia and over Guam. In the surveilled areas, TEC reductions due to solar extreme ultraviolet (EUV) obstruction during the eclipse were more prominent at coordinate points located further east, closer to the point of greatest eclipse duration in the middle of the Pacific. In addition, we also discuss observations of medium-scale traveling ionospheric disturbances (MSTIDs) associated with the passage of this solar eclipse. Signatures of eclipse-related TIDs were seen in the TEC perturbation (TECP) signals from several GPS receiver stations in eastern part of Indonesia and in the Doppler signals from ionosonde measurements at Guam. These MSTIDs were observed at F-region heights with a period of 30–45 min, Doppler velocity amplitude of 15 m/s, and TECP fluctuations of 0.3–0.4 TECU.

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2016 年 3 月 9 日东南亚-太平洋日全食期间的电离层效应，第 2 部分：电子总量减少和波动模式

我们报告了对 2016 年 3 月 9 日东南亚-太平洋地区日全食期间电离层效应的观测和数据分析。在此，我们介绍了对日食经过地区的电子总含量（TEC）分布时空变化的观测。在印度尼西亚东部和关岛上空观测到的 TEC 值减少了 10-14 TECU。在被观测地区，日食期间由于太阳极紫外光（EUV）阻挡而导致的 TEC 减少在位于更东边的坐标点更为显著，这些坐标点更靠近太平洋中部日食持续时间最长的点。此外，我们还讨论了与此次日食有关的中尺度巡游电离层扰动的观测结果。从印度尼西亚东部几个全球定位系统接收站的 TEC 扰动（TECP）信号和关岛电离层探测仪测量的多普勒信号中可以看到与日食有关的中尺度巡游电离层扰动。在 F 区域高度观测到这些 MSTID，周期为 30-45 分钟，多普勒速度振幅为 15 米/秒，TECP 波动为 0.3-0.4 TECU。

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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.