刘立波+陈一定+乐会军+袁运斌+杜爱民

摘要：观测研究显示，电离层呈现不同时间尺度的变化，可以将这些变化分为气候尺度和天气尺度的变化。本研究有选择地简要介绍在电离层气候学特性方面取得的相关进展，涉及如下内容：（1）电离层的季节变化，通过对综合探测资料的分析和模式模拟，展示了在不同高度上季节变化特性的地区与全球图像；（2）电离层的太阳活动性依赖，特别是系列工作发现，电离层电子密度对太阳极紫外（EUV）辐射通量的响应趋势，在统计上可存在准线性、放大和饱和三种变化类型，与所处的高度和经纬度、季节、地方时有关；（3）电离层建模。这些工作深化了对电离层状态与基本过程的认识，有助于研究电离层的天气过程，并能够为以后电离层建模、预报和相关工程应用提供有益的指导。

关键词：电离层；气候学；太阳活动

General report on "Response and application models of the ionosphere over 120°E meridional chain"

Abstract：The ionosphere varies over multiply time scales， which are classified into two categories： the climatology and weather variations. In this national report， we give a brief summary of recent progresses in ionospheric climatology with focus on （1） the seasonal variations， （2） solar cycle effects， and （3） empirical modelings of the ionosphere. The seasonal variations of the ionosphere have been explored in many works to give a more detailed picture with regional and global features at various altitudes by analyzing the observation data from various sources and modelings. Moreover， a series of studies reported the response of the ionosphere to solar cycle variations， which revealed some novel and detailed features of solar activity dependence of ionospheric parameters at different altitudes. These investigations have improved our understanding on the states of the ionosphere and underlying fundamental processes， provided clues to future studies on ionospheric weather， and guided ionospheric modeling， forecasting and related applications.

Keywords：ionosphere； climatology； solar activity

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