Modelling and Observation of Sporadic E Layers and their dependence on upper atmospheric dynamics

零星 E 层的建模和观测及其对高层大气动力学的依赖性

• 批准号: 128388339
• 负责人: Professor Dr. Jens Wickert
• 金额: --
• 依托单位: Institut für Geodäsie und Geoinformationstechnik
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2009
• 资助国家: 德国
• 起止时间: 2008-12-31 至 2011-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/128388339?language=en
• 关键词: Modelling; Observation; Sporadic; Layers; their

Knowledge on spatial and temporal variations of ionospheric irregularities can be used to increase the reliability of communication and navigation systems, but also for scientific investigations of coupling processes in the upper atmosphere. Within the proposed research project the formation of lower ionospheric sporadic E layers and their global distribution will be investigated in more detail based on satellite observations and model calculations. The main objective of this project is to analyse the global sporadic E distribution with respect to upper atmospheric dynamics, the Earth’s magnetic field and lower E region ionisation rates. GPS radio occultation data from the satellites CHAMP, GRACE and FORMOSAT- 3/COSMIC will be used to derive global distributions of sporadic E. These distributions will be correlated with global satellite based measurements of the thermospheric wind field and the Earth’s magnetic field. In addition a numerical model will be developed and applied to investigate the formation of sporadic E on a global scale and to interpret the observed global distributions of sporadic E. Ionisation rates in the lower ionosphere from meteor radar measurements are used as an important input parameter of the modelling. The developed model will be validated and applied within case studies to investigate open questions in the interpretation of the observed annual cycle of sporadic E occurrence, its spatial and temporal distribution and its correlation with the Earth’s magnetic field.

关于电离层不规则性时空变化的知识可用于提高通信和导航系统的可靠性，也可用于对高层大气中的耦合过程进行科学调查。在拟议的研究项目范围内，将根据卫星观测和模型计算，更详细地调查低电离层零星E层的形成及其全球分布情况。该项目的主要目标是分析全球零星E分布与高层大气动力学、地球磁场和低E区电离率的关系。利用CHAMP、GRACE和FORMOSAT- 3/COSMIC卫星的GPS无线电掩星观测资料，计算全球散发性E.这些分布将与基于全球卫星的热层风场和地球磁场测量相关联。此外，还将建立一个数值模式，并应用于研究全球范围内偶发E的形成和解释观测到的偶发E的全球分布。流星雷达测量的低电离层电离率被用作建模的一个重要输入参数。开发的模型将进行验证，并在案例研究中应用，以调查在解释所观察到的零星E发生的年度周期，其空间和时间分布及其与地球磁场的相关性的开放性问题。