2020 Volume 46 Issue 4 Pages 46-54
Based on the database (ver-1, ver-2) of a spectral irradiance for all weather conditions, which was released by the New Energy and Industrial Technology Development Organization (NEDO), the solar spectral irradiance from the relation among spectral irradiance, global irradiance, sunshine ratio, solar altitude and precipitation was investigated. The data were recorded from sunrise to sunset, at each time interval of 10 minute JST. These data were divided by an one-hour datum, as average of the seven original data by per one hour. By mean of normalized spectral irradiance the peak energy of the solar spectral irradiance, it can made of expect global solar irradiance and weather conditions on solar spectral irradiance. The normalized solar irradiance of stable fine day was defined as a standard normalized spectral irradiance (HYst). By this additional method, it was cleared that the correlation between the global solar radiation and the peak energy of solar spectral irradiance.