Role of thermosphere‐ionosphere coupling in a global ionospheric specification
Role of thermosphere‐ionosphere coupling in a global ionospheric specification
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DOI：
10.1029/2010rs004576
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发表时间：
2011-12
期刊：
影响因子：
1.6
通讯作者：
T. Matsuo;E. Araujo‐Pradere
中科院分区：
文献类型：
--
作者：
T. Matsuo;E. Araujo‐Pradere
在本文中，我们介绍了我们最近的研究进展，在该地区的电离层规格通过地面观测数据同化。美国国家海洋和大气管理局的总电子含量规范方法（即高斯马尔可夫卡尔曼滤波器与电离层的经验模型作为背景模型）在美国大陆最近已扩展到多区域域和整个地球仪。对全球TEC图的分析揭示了热层-电离层耦合的动力学和成分性质的明确特征，即使基本的规范方法没有考虑热层效应。这表明，电子密度的地面观测包含了一些关于热层状态的信息。通过在一个原型Enkleman卡尔曼滤波器（EnKF）中使用热层电离层大气环流模型，我们研究了热层-电离层耦合在全球电离层规范中的作用。为全球电离层探测仪网络设计的观测系统模拟实验表明，电离层数据同化在预报模式和同化方案中大大受益于热层-电离层耦合的自洽处理，这两者都可以通过使用EnKF固有地实现。
In this paper we present our recent research development in the area of ionospheric specification by means of data assimilation of ground‐based observations. NOAA's Total Electron Content specification methodology (namely, a Gauss‐Markov Kalmanfilter with an empirical model of the ionosphere as a background model) over the continental United States has lately been expanded to the multiregional domains and to the entire globe. Analyses of the global TEC maps reveal clear signatures of thermosphere‐ionosphere coupling, in both dynamical and compositional nature, even though the underlying specification methodology does not take thermospheric effects into account. This suggests that ground‐based observations of electron density contain some information about the state of the thermosphere. By using a thermosphere ionosphere general circulation model in a prototype Ensemble Kalman filter (EnKF), we examine the role of thermosphere‐ionosphere coupling in a global ionospheric specification. Observing system simulation experiments, designed for a global network of ionosondes, suggest that ionospheric data assimilation considerably benefits from self‐consistent treatment of thermosphere‐ionosphere coupling in a forecast model as well as in assimilation schemes, both of which can be achieved inherently by using the EnKF.