Behavior of Na atoms in the lunar exosphere during activity of meteor showers oleh A. A. Berezhnoy, K. I. Churyumov, V. V. Shevchenko, A. A. Buchachenko, O. R. Baransky, T. K. Churyumova, V. V. Kleshchenok, E. A. Kozlova, V. O. Ponomarenko, A. V. Stolyarov, O. V. Tvorun