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通过讨论太阳电磁辐射与大气的相互作用，阐述电离层的形成、电离层对电磁波的影响以及短波通信和卫星通信的原理。
By discussing the interaction between solar electromagnetic radiation and the atmosphere, the formation of ionosphere, the influence of ionosphere on electromagnetic wave and the principle of shortwave communication and satellite communication are described.