Effects of the terdiurnal tide on the sporadic E (Es) layer development at low latitudes over the Brazilian sector

IF 1.7 4区地球科学 Q3 ASTRONOMY & ASTROPHYSICS

Annales Geophysicae Pub Date : 2023-04-21 DOI:10.5194/angeo-41-209-2023

P. A. Fontes, M. Muella, L. Resende, V. Andrioli, P. Fagundes, V. G. Pillat, P. Batista, A. J. Carrasco

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引用次数: 2

Abstract

Abstract. Sporadic E (Es) layers are patches of high ionization observed at around 100–140 km height in the E region. Their formation at low latitudes is primarily associated with the diurnal and semidiurnal components of the tidal winds via the ion convergence driven by the wind shear mechanism. However, recent studies have shown the influence of other tidal modes, such as the terdiurnal tide. Therefore, this work investigates the effect of terdiurnal tide-like oscillations on the occurrence and formation of the Es layers observed over Palmas (10.17∘ S, 48.33∘ W; dip lat. −7.31∘), a low-latitude station in Brazil. The analysis was conducted from December 2008 to November 2009 by using data collected from CADI (Canadian Advanced Digital Ionosonde). Additionally, the E Region Ionospheric Model (MIRE) was used to simulate the terdiurnal tidal component in the Es layer development. The results show modulations of 8 h periods on the occurrence rates of the Es layers during all seasonal periods. In general, we see three well-defined peaks in a superimposed summation of the Es layer types per hour in summer and autumn. We also observed that the amplitude modulation of the terdiurnal tide on the Es occurrence rates minimizes in December in comparison to the other months of the summer season. Other relevant aspects of the observations, with complementary statistical and periodogram analysis, are highlighted and discussed.

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日潮对巴西扇区低纬度地区零星E (Es)层发展的影响

摘要零星的E (Es)层是在E区大约100-140千米高度观测到的高电离斑块。它们在低纬度的形成主要通过风切变机制驱动的离子辐合与潮汐风的日、半日分量有关。然而，最近的研究表明，其他潮汐模式的影响，如昼夜潮汐。因此，本研究探讨了在帕尔马斯观测到的日潮振荡对Es层发生和形成的影响(10.17°S, 48.33°W;- 7.31°)，巴西的一个低纬度站。分析从2008年12月到2009年11月进行，使用的数据来自加拿大先进数字离子探空仪(mcadi)。此外，利用区域电离层模式(MIRE)模拟Es层发展过程中的昼夜潮汐分量。结果表明，在所有季节期间，Es层的发生率有8个周期的变化。一般来说，我们在夏秋两季每小时Es层类型的叠加中看到三个明确的峰值。我们还观察到，与夏季的其他月份相比，12月的日较潮对Es发生率的振幅调制最小。其他相关方面的观察，与互补的统计和周期图分析，强调和讨论。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Annales Geophysicae 地学-地球科学综合

CiteScore

4.30

自引率

0.00%

发文量

审稿时长

2 months

期刊介绍： Annales Geophysicae (ANGEO) is a not-for-profit international multi- and inter-disciplinary scientific open-access journal in the field of solar–terrestrial and planetary sciences. ANGEO publishes original articles and short communications (letters) on research of the Sun–Earth system, including the science of space weather, solar–terrestrial plasma physics, the Earth''s ionosphere and atmosphere, the magnetosphere, and the study of planets and planetary systems, the interaction between the different spheres of a planet, and the interaction across the planetary system. Topics range from space weathering, planetary magnetic field, and planetary interior and surface dynamics to the formation and evolution of planetary systems.