劉立波+陳一定+樂會(huì)軍+袁運(yùn)斌+杜愛民

摘要：觀測(cè)研究顯示，電離層呈現(xiàn)不同時(shí)間尺度的變化，可以將這些變化分為氣候尺度和天氣尺度的變化。本研究有選擇地簡(jiǎn)要介紹在電離層氣候?qū)W特性方面取得的相關(guān)進(jìn)展，涉及如下內(nèi)容：（1）電離層的季節(jié)變化，通過對(duì)綜合探測(cè)資料的分析和模式模擬，展示了在不同高度上季節(jié)變化特性的地區(qū)與全球圖像；（2）電離層的太陽(yáng)活動(dòng)性依賴，特別是系列工作發(fā)現(xiàn)，電離層電子密度對(duì)太陽(yáng)極紫外（EUV）輻射通量的響應(yīng)趨勢(shì)，在統(tǒng)計(jì)上可存在準(zhǔn)線性、放大和飽和三種變化類型，與所處的高度和經(jīng)緯度、季節(jié)、地方時(shí)有關(guān)；（3）電離層建模。這些工作深化了對(duì)電離層狀態(tài)與基本過程的認(rèn)識(shí)，有助于研究電離層的天氣過程，并能夠?yàn)橐院箅婋x層建模、預(yù)報(bào)和相關(guān)工程應(yīng)用提供有益的指導(dǎo)。

關(guān)鍵詞：電離層；氣候?qū)W；太陽(yáng)活動(dòng)

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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