US-Nigeria Cooperative Research: Improvements of the International Reference Ionosphere at Low Latitudes

美国-尼日利亚合作研究：低纬度国际参考电离层的改进

• 批准号: 0002144
• 负责人: Dieter Bilitza
• 金额: $ 4.04万
• 依托单位: Raytheon Technical Services Company
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-02-01 至 2004-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0002144&HistoricalAwards=false
• 关键词: US; Nigeria; Cooperative; Research; Improvements

0002144BilitzaThis award supports a three-year collaborative research project among Dr. Dieter Bilitza, with the Raytheon Technical Services Company at Goddard Space Flight Center in Greenbelt, MD; Professor Jacob Olusegun Adeniyi, of the Department of Physics at the University of Ilorin in Nigeria; and Professor Olivier Obrou, at the Laboratoire de Physique de l'Atmosphere at the University of Cocody in the Ivory Coast. The ionosphere is that part of the atmosphere which lies between the mesophere and the exosphere. Its layers are ionized by solar ultraviolet radiation, which facilitates the transmission of certain radio waves over long distances on earth. A good knowledge of ionospheric electron density is essential for any ground or space remote sensing technique that uses the ionospheric radio waves for the transmission of its signals. The most widely used model for determining these densities, the International Reference Ionosphere (IRI), lacks a description of the low latitude regions where the largest electron densities occur, which limits its ability to provide the corrections needed by navigation and communications systems. The three investigators will analyze equatorial observations of the bottom-side ionospheric electron density profiles collected by four ground-based sounders located near the magnetic equator in Burkina Faso, Nigeria, and the Ivory Coast. The results will be used to improve the specification of electron density in the IRI model. This information complements existing measurements in the American, Indian, and Pacific sectors, and completes the collection of electron density data from the longitudinal chain of ground-based sounders near the magnetic equator. These data sets will also enable the researchers to develop a quantitative description of the variability of the equatorial ionosphere in the African sector. This project combines the manual ionogram scaling done at the four stations with modern ionogram reduction techniques. Through this project the principal investigators expect to achieve a better understanding of the processes that shape the equatorial ionosphere, which will lead to improvements in the IRI standard model. An updated IRI model, which includes African measurements, will benefit future researchers, and it will also have broad application in high frequency and ground-to-satellite communications systems. Additionally, the anticipated results should expand the knowledge about ionospheric physics.The Division of International Programs and the Division of Atmospheric Sciences are jointly providing funding for this project.

0002144Bilitzathis奖为Dieter Bilitza博士的三年合作研究项目与马里兰州格林贝尔特Goddard Space Flight Center的雷神技术服务公司进行了为期三年的合作研究项目；尼日利亚伊洛林大学物理系的雅各布·奥卢塞贡·阿德尼（Jacob Olusegun Adeniyi）教授；以及奥利维尔·奥布鲁（Olivier Obrou）教授，在象牙海岸的Cocody大学的Laboratoire de L'Asperie。 电离层是间层和外层之间大气的一部分。 它的层是通过太阳能紫外线辐射电离的，这有助于在地球上长距离延伸某些无线电波的传播。 对电离层电子密度的良好知识对于使用电离层无线电波传输的任何地面或空间遥感技术至关重要。 确定这些密度的最广泛使用的模型，即国际参考电离层（IRI），缺乏对发生最大电子密度的低纬度区域的描述，这限制了其提供导航和通信系统所需的校正的能力。 这三个研究人员将分析赤道观察的赤道观察结果，该观察由位于尼日利亚布基纳法索（Burkina Faso）和象牙海岸（Ivory Coast）的磁性赤道附近收集的四个地面声音器收集的底部电离层电子密度。 结果将用于改善IRI模型中电子密度的规范。 该信息补充了美国，印度和太平洋部门中的现有测量，并从磁赤道附近的地面探空仪的纵向链中填写了电子密度数据的收集。 这些数据集还将使研究人员能够对非洲部门赤道电离层的变异性进行定量描述。 该项目结合了在四个站点进行的手动离子图缩放与现代离子图还原技术。 通过该项目，主要研究人员希望更好地了解塑造赤道电离层的过程，这将改善IRI标准模型。 更新的IRI模型（包括非洲测量结果）将使未来的研究人员受益，并且还将在高频和地面通信系统中广泛应用。 此外，预期的结果应扩大有关电离层物理学的知识。国际计划和大气科学划分的部门共同为该项目提供资金。