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中文摘要：
秉含着不同时间尺度的太阳电磁辐射变化无疑会调制电离层.作为电离层物理的核心问题之一,电离层对太阳活动性的依存关系是认知电离层结构与演变的基础.本文简要地综述最近一些年在电离层的太阳活动性依赖特性方面取得的进展,涉及的内容包括：（1）在太阳辐射的观测与太阳活动指数方面,以电离层研究的视角评述了太阳活动指数存在的问题,统计证实了太阳活动指数与EUV辐射通量间的非线性关系,以及改进太阳活动指数的一些努力;（2）阐述了在不同高度电离层的太阳活动性依赖性的工作进展,特别是最近的统计研究发现,随着太阳EUV辐射通量变化,电离层电子密度变化趋势与所在纬度、季节、地方时和高度有关,可区分为准线性、放大和饱和3种类型,取决于不同的主控物理过程;（3）太阳活动历史序列和23/24太阳活动周极低展示出太阳活动性存在极端现象,讨论了太阳辐射极端条件下的电离层状态;（4）在电离层的耀斑响应方面,对全球观测数据的分析研究揭示出耀斑期间电离层响应与一些太阳参数的统计关系,特别是修正了以往关于电离层响应与天顶角无关的错误论断.利用电离层模式成功模拟了耀斑期间电离层响应的季节、地方时变化和高度差异等的观测特征.以上相关工作有助于理解电离层的基本过程,并为电离层建模、预报和相关工程应用提供指导.
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