分层电离层模型中的L电流体系

本文分析了电离层风发电机理论中影响电流分布的几种主要因素,认为电离层电导率模型是最主要的影响因素。在计算太阴日变化（L）电流体系时,本文放弃了过去习惯采用的无限薄球壳的电导率模型,使用了分层电导率模型。考虑电导率随高度的变化以及电导率极大值的高度随纬度的变化,得到了与观测结果较为符合的理论L电流体系。本文的结果还指出,在处理某些全球性发电机理论问题时,不能简单地假定电离层为距地面等高度的无限薄球壳,而必须同时考虑大气潮汐振荡的特性及电导率随高度的变化。由此得出结论:发展三维电导率模型对于电离层风发电机理论是必要的。

L CURRENT SYSTEM IN A MULTI-LAYER IONOSPHERIC MODEL

Three main factors have been analysed for their influence on current distribution in the ionospheric wind dynamo theory. The conductivity model of the ionosphere is considered as the most important factor A multi-layer ionospheric model, in stead of the conventional thin shell model, has been employed to calculate L current system in the ionosphere. Considering height variation of conductivity and latitudinal dependence of the altitude of conductivity peak, a theoretical L current system has been obtained, which agrees with observation much better than that for thin shell model.It is pointed out that the assumption of thin shell conductivity is unreasonable even for global problems. It is necessary to consider the characteristics of atmospheric tidal oscillations and height variation of ionospheric conductivity. In conclusion, development of a three dimensional model of the ionospheric conductivity is necessary in discussion on some problems about ionospheric wind dynamo theory.