On the low-latitude ionospheric irregularities under geomagnetically active and quiet conditions using NavIC observables: A spectral analysis approach

IF 1.8 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Journal of Atmospheric and Solar-Terrestrial Physics Pub Date : 2024-10-22 DOI:10.1016/j.jastp.2024.106369
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Abstract

Ionospheric irregularities and associated scintillations under geomagnetically active/quiet conditions have detrimental effects on the reliability and performance of space- and ground-based navigation satellite systems, especially over the low-latitude region. The current work investigates the low-latitude ionospheric irregularities using the phase screen theory and the corresponding temporal Power Spectral Density (PSD) analysis to present an estimate of the outer irregularity scale sizes over these locations. The study uses simultaneous L5 signal C/No observations of NavIC (a set of GEO and GSO navigation satellite systems) near the northern crest of EIA (Indore: 22.52N, 75.92E, dip: 32.23N) and in between the crest and the dip equator (Hyderabad: 17.42N, 78.55E, dip: 21.69N). The study period (2017–2018) covers disturbed and quiet-time conditions in the declining phase of the solar cycle 24. The PSD analysis brings forward the presence of irregularities, of the order of a few hundred meters during weak-to-moderate and quiet-time conditions and up to a few km during the strong event, over both locations. The ROTI values validate the presence of such structures in the Indian region. Furthermore, only for the strong event, a time delay of scintillation occurrence over Indore, with values of 36 min and 50 min for NavIC satellites (PRNs) 5 and 6, respectively, from scintillation occurrence at Hyderabad is observed, suggesting a poleward evolution of irregularity structures. Further observations show a westward propagation of these structures on this day. This study brings forward the advantage of utilizing continuous data from the GEO and GSO satellite systems in understanding the evolution and propagation of the ionospheric irregularities over the low-latitude region.
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利用 NavIC 观测数据研究地磁活跃和安静条件下的低纬度电离层不规则性:光谱分析方法
地磁活跃/安静条件下的电离层不规则现象和相关闪烁对空间和地面导航卫星系统的可靠性和性能有不利影响,特别是在低纬度地区。目前的工作利用相屏理论和相应的时间功率谱密度分析对低纬度电离层不规则现象进行了研究,提出了对这些地点外部不规则现象规模大小的估计。该研究使用了在 EIA 北部波峰附近(印多尔:22.52∘N,75.92∘E,倾角:32.23∘N)和波峰与倾角赤道之间(海得拉巴:17.42∘N,78.55∘E,倾角:21.69∘N)的 NavIC(一组地球同步轨道和地球同步轨道导航卫星系统)的 L5 信号 C/No 同步观测。研究时段(2017-2018 年)涵盖了太阳周期 24 递减阶段的扰动和静止状态。PSD 分析表明,这两个地点存在不规则现象,在弱至中等强度和静止期间为几百米,在强事件期间可达几千米。ROTI 值验证了印度地区存在此类结构。此外,仅在强事件中,NavIC 卫星(PRNs)5 号和 6 号在印多尔上空发生闪烁的时间与海德拉巴发生闪烁的时间分别延迟了 36 分钟和 50 分钟,这表明不规则结构是向极地演化的。进一步的观测表明,这些结构在这一天向西传播。这项研究提出了利用地球同步轨道和地球静止轨道卫星系统的连续数据来了解低纬度地区电离层不规则结构的演变和传播的优势。
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来源期刊
Journal of Atmospheric and Solar-Terrestrial Physics
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
95
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.
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