Refractive index measurements in the lowest troposphere in the Czech Republic

The report presents the results of measurement of the atmospheric refractive index in the lowest troposphere carried out recently in the Czech Republic. Two experiments, which are based on the long-term tower measurement of the temperature, the pressure and the relative humidity in different altitudes, are described. Statistics of the refractive index and its vertical gradient are presented. Seasonal and diurnal variation of the refractivity statistics is shown.