太阳是个巨大的辐射源,它每时每刻都在向宇宙空间辐射能量。太阳辐射的能量是随波长的变化而变化的,不同波长的辐射具有不同的能量,太阳辐射的这种性质可用光谱能量分布来表示。在地球大气上界,单位波长间隔、单位时间、单位面积内的太阳辐射 The sun is a huge source of radiation that radiates energy into cosmic space at all times. The energy of the solar radiation varies with the wavelength, and the radiation of different wavelengths has different energies. This property of solar radiation can be expressed by the spectral energy distribution. In the upper atmosphere of the Earth’s atmosphere, the unit wavelength interval, unit time, the unit area of ​​solar radiation