Institution: | (1) Fock Institute of Physics, St. Petersburg State University, ul. Uls’yanovskaya 1, Petrodvorets, St. Petersburg, 198504, Russia;(2) Russian State Hydrometeorological University, Malookhtinskii pr. 98, St. Petersburg, 195196, Russia;(3) Institute of the Ionosphere, Kamenskoe plato, Almaty, 480020, Kazakhstan |