S. Sobhkhiz-Miandehi, Y. Yamazaki, C. Arras, Y. Miyoshi, H. Shinagawa, A. P. Jadhav
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引用次数: 0
摘要
零星 E 层或 Es 层是一种电离层现象,其特点是地球表面 90-120 公里范围内的电 子密度增强。根据风切变理论,Es 层的形成与地球磁场存在时水平风中的垂直切变有关。本研究探讨了行星波在诱发这些垂直剪切并随后形成埃斯层方面的作用。我们的研究得益于 FORMOSAT-7/COSMIC2 和 Spire 任务提供的大量数据,这些数据具有广泛的全球覆盖范围。我们对射电掩星测量得出的 S4 指数所代表的 Es 强度进行了波分析,以寻找潜在的行星波特征。此外,还利用 Aura/MLS 的测量结果分析了位势高度的相应光谱,从而对 Es 层的行星波特征和位势高度变化进行了比较研究。研究结果揭示了具有特定波数和周期的西向和东向波成分,表明西向传播的准 6 天行星波、准 4 天行星波和东向传播的周期约为 3 天的开尔文波参与了低纬度 Es 层的形成。
Planetary Wave Signature in Low Latitude Sporadic E Layer Obtained From Multi-Mission Radio Occultation Observations
The Sporadic E layer or Es is an ionospheric phenomenon characterized by enhancements in electron density within 90–120 km above the Earth's surface. Based on the wind shear theory, the formation of Es layers is associated with vertical shears in the horizontal wind, in the presence of the Earth's magnetic field. This study explores the role of planetary waves on inducing these vertical shears and subsequently shaping Es layers. Our investigations benefit from a large amount of data facilitated by the FORMOSAT-7/COSMIC2 and Spire missions, which offer extensive global coverage. A wave analysis is applied to the Es intensity as represented by the S4 index derived from radio occultation measurements, in search of potential planetary wave signatures. Additionally, measurements from Aura/MLS are used to analyze corresponding spectra for the geopotential height, enabling a comparative examination of planetary wave signatures in the Es layer and geopotential height variations. The findings reveal westward and eastward wave components with specific wavenumbers and periods, suggesting the involvement of westward propagating quasi 6-day, quasi 4-day planetary waves, and eastward propagating Kelvin waves with a period of around 3 days in Es layer formation at low latitudes.
期刊介绍:
Marking AGU’s second new open access journal in the last 12 months, Earth and Space Science is the only journal that reflects the expansive range of science represented by AGU’s 62,000 members, including all of the Earth, planetary, and space sciences, and related fields in environmental science, geoengineering, space engineering, and biogeochemistry.