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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.
Changes in the solar electromagnetic radiation that contain different time scales undoubtedly modulate the ionosphere.As one of the core issues in ionospheric physics, the dependence of the ionosphere on solar activity is the basis of the cognitive ionosphere structure and evolution. The progress made in recent years in ionospheric solar activity dependence is summarized. The contents include: (1) In the aspect of solar radiation observation and solar activity index, the solar activity index is reviewed from the perspective of ionospheric research Problems and statistics confirm the non-linear relationship between solar activity index and EUV radiation flux and some efforts to improve the solar activity index. (2) The work progress of solar activity dependence at different height ionosphere is expounded, especially Recent statistical studies have found that as the solar EUV radiative flux changes, the ionospheric electron density trends are related to latitude, season, time and altitude, and can be differentiated into three types: quasi-linear, amplification and saturation, depending on different Master physics; (3) Solar activity history series and 23/24 solar week show extreme extreme low solar activity, discussion (4) In the ionospheric flare response, the analysis of the global observation data reveals the statistical relationship between the ionospheric response and some solar parameters during flare, and in particular, The ionosphere responds to erroneous assertions that are not related to the zenith angle.The observed features of the ionospheric response during the flare, such as season, local time variation and altitude difference, are successfully simulated by the ionospheric model.The above work is helpful to understand the basic process of ionosphere , And provide guidance for ionospheric modeling, forecasting and related engineering applications.