Understanding the global dynamics of the equatorial ionosphere in Africa for space weather capabilities: A science case for AfrequaMARN
Understanding the global dynamics of the equatorial ionosphere in Africa for space weather capabilities: A science case for AfrequaMARN
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了解非洲赤道电离层的全球动态以提高空间天气能力：AfrequaMARN 的科学案例
DOI：
10.1016/j.jastp.2018.01.008
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发表时间：
2019
影响因子：
1.9
通讯作者：
Lawal H
中科院分区：
文献类型：
--
作者：
Lawal H
地球电离层的赤道区域是最复杂的电离层区域之一，由于其相互作用，不稳定性和一些尚未解决的问题，其动力学，电动力学和物理过程。赤道电离层横跨三大洲，最长的区域是非洲大陆。卫星观测表明，非洲部分与其他纵向部分相比，电离层不规则性的形成存在很大差异。这可能是由于磁赤道在大陆上的对称形状和纬度缺乏变化的结果。在本文中，我们提出了一个科学运动，配备地面仪器，特别是磁力计和雷达的磁赤道的非洲部门。拟议的雷达网在风格和技术上与高纬度SuperDARN雷达网相似，而磁力计将沿着赤道带排列。这两个拟议的空间物理仪器将用于在很长一段时间内，至少在一个太阳活动周期内研究赤道电离层的这一区域。在非洲磁赤道部分部署一个磁力仪阵列（AfrequaMA）和一个雷达网络（AfrequaRN），共同称为非洲赤道磁力仪阵列和雷达网络（AfrequaMARN），将对非洲部分的电磁变化进行同时观测。我们还研究了可能的科学问题，如磁力计阵列和雷达网络将能够解决，无论是单独和与其他天基和地基仪器。拟议的项目将明显提高我们对赤道电离层动态的认识，以及对它在平衡大规模电离层电流系统方面的作用的认识，并将有助于提高我们对电离层和等离子体层密度进行适当建模的能力。它还将增进我们对全球电离层过程的了解，从而提高非洲和国际空间科学界的空间气象能力。
The equatorial region of the Earth's ionosphere is one of the most complex ionospheric regions due to its interactions, instabilities, and several unresolved questions regarding its dynamics, electrodynamics, and physical processes. The equatorial ionosphere overall spans three continents with the longest region being that over the African continent. Satellite observations have demonstrated that very large differences exist in the formation of ionospheric irregularities over the African sector compared with other longitudinal sectors. This may be a consequence of the symmetric shape of the magnetic equator over the continent and the lack of variability in latitude. In this paper, we propose a science campaign to equip the African sector of the magnetic equator with ground-based instruments, specifically magnetometers and radars. The network of radars proposed is similar in style and technique to the high-latitude SuperDARN radar network, while the magnetometers will form an array along the equatorial belt. These two proposed space physics instruments will be used to study this region of the equatorial ionosphere over a long interval of time, at least one solar cycle. The deployment of an array of magnetometers (AfrequaMA) and a radar network (AfrequaRN) in the African sector of the magnetic equator is jointly called the Africa Equatorial Magnetometer Array and Radar Network (AfrequaMARN), which will provide simultaneous observations of both electric and magnetic variations over the African sector. We also examine the possible science questions such a magnetometer array and radar network would be able to address, both individually and in conjunction with other space-based and ground-based instrumentation. The proposed projects will clearly improve our understanding of the dynamics of the equatorial ionosphere and our understanding of its role in balancing the large-scale ionospheric current system, and will contribute to our ability to adequately model ionospheric and plasmaspheric densities. It will also enhance our understanding of global ionospheric processes, which will improve the space weather capabilities of the African and international space science communities.
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