Zhongsheng Guo, Institute of Soil and Water Conservation, Northwest A F University, Chinese Academy of Science，Xinong Road 26#, Yangling, Shaanxi Province,712100, P.R.China

Abstract
It is important to understand the daily variation law of solar radiation flux density incident on the horizontal surface for such research and application fields as architecture, industry, agriculture, environment, hydrology, agrology, meteorology, limnology, oceanography and ecology. However, there is not a model or theory to better explain the daily variation of solar radiation near the ground. In this study, the daily variation of solar radiation flux density incident on the horizontal surface is developed and the data investigated in Automatic meteorological station, Changwu ecoexperimental station, China is used to test the theory. The results showed that generally sky conditions is stable, and the daily dynamic of the solar radiation flux density incident on the horizontal surface near the ground is the function of time, which can be described by a normal distribution model in a day. The main parameters of the model change with date and the meteorological conditions in a day.

Keywords
Horizontal surface; Solar radiation Flux density; time; sky conditions; Daily variation model; Diurnal total solar energy; Ecological environment

Cite this paper
Zhongsheng Guo, Daily Variation Law of Solar Radiation Incident on the Horizontal Surface near the Ground , SCIREA Journal of Chemistry. Volume 4, Issue 2, April 2019 | PP. 70-81.

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