Atmospheric activity concentration of 7Be in the air was monitored during the period of one year from September 2015 to September 2016 at Ostrava, Czech Republic, with a two-day frequency that is shorter compared to a standard 7-day frequency of routine 7Be measurements. Simultaneously, relevant meteorological data (temperature, rainfall amount, precipitation particle size and speed, tropopause height, and PM10 concentrations) and the sunspot number were accumulated. Weighted linear regression analysis applied to the 7Be atmospheric activity concentration, the measured meteorological explanatory variables and the sunspot number revealed temperature as the most statistically significant explanatory variable. The tree model proved temperature as the most important explanatory variable and predicted the threshold value separating low and high temperature behavior of 7Be at about 13 °C (2-day average). A simple local two-layer (stratosphere and troposphere) atmospheric model was then applied to the data analysis. The model is able to fit the data for a larger accumulation period (6 days).

Department of Geoinformatics VŠB Technical University of Ostrava 17 listopadu 2172 15 Ostrava 708 00 Czech Republic

Department of Physics and Institute of Clean Technologies VŠB Technical University of Ostrava 17 listopadu 2172 15 CZ 708 00 Ostrava Czech Republic

Department of Physics VŠB Technical University of Ostrava 17 listopadu 2172 15 CZ 708 00 Ostrava Czech Republic

ŠKODA JS a s Orlík 266 CZ 316 00 Plzeň Czech Republic

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