Solar uv radiation and ozone dynamics over Bulgaria

This paper presents an investigation of the solar UV radiation dynamics and the total ozone content (TOC) behaviour over Bulgaria in the time period 1996-2005. The data are received from measurements, using the spectrophotometer Photon, placed in Stara Zagora. We also use ozone data from satellite experiments TOMS. The data analysis shows: • ·there isn't a statistically significant TOC trend over Bulgaria in the last 10 years; • the largest TOC variations are in the winter-spring and the lowest - in the summer; • ·a strong dependence between UV-B solar radiation reaching the Earth surface and TOC is received (r = -0.62 ±0.18) at 98 % confidence level.