Periodic variations in ozone concentration and direct insolation in the ground layer of the atmosphere

The variations in the solar radiation intensity (SRI) at the earth's surface and the concentration of ozone at the ground level were observed. Ozone observations were made at a height of 1.5 m above the ground. Each series of measurements included about 100 point SRI and O3 readings, made simultaneously at intervals of 25 seconds. The interval between the measurement series was about 1 hour. The results show that the periods of the first and second harmonics of the variations in solar radiation intensity and [O3] are practically identical and are independent of place, time of day, or weather conditions. There exists a correlation between the fluctuations in [O3] and SRI with a coefficient of correlation of about 0.74, and the fluctuations of [O3] are of photochemical origin.