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Solar Irradiance: basic concepts

Abstract

The solar radiation or irradiance influences chemical, physical and biological processes on the Earth. This radiation emitted from the solar atmosphere through different layers can affect the Earth's upper atmosphere and climate. An overview about the Sun were presented. The physical description of Total Solar Irradiance (TSI) and Solar Spectral Irradiance (SSI) are explained. Some models of irradiance are briefly described. The relationship between the solar irradiance and the Earth's climate were discussed.

Keywords:
Sun; Irradiance; Electromagnetic radiation; Solar features; Earth's climate

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