蓝天太阳辐射通过大气,遇到空气分子、尘粒、云滴等质点时,都要发生散射,如果太阳辐射遇到直径比波长小的空气分子,如氮、二氧化碳、臭氧分子等,其散射能力与波长的对比关系是:对于一定大小的分子来说,散射能力与波长的四次方成反比,这种散射是有选择性的,即波长越短散射越强, When solar radiation passes through the atmosphere and encounters particles of air molecules, dust particles, and cloud droplets, scattering occurs. If solar radiation encounters air molecules with a diameter smaller than the wavelength, such as nitrogen, carbon dioxide, and ozone molecules, their scattering ability The relationship with the wavelength is: for a certain size of the molecule, the scattering capacity is inversely proportional to the fourth power of the wavelength, this scattering is selective, that is, the shorter the wavelength, the stronger the scattering.