Yu.V. Vekshin – Master, Junior Research Scientist, Institute of Applied Astronomy RAS (Saint Petersburg) E-mail: yuryvekshin@yandex.ru

A.P. Lavrov – Dr.Sc.(Phys.-Math.), Senior Research Scientist, Professor, Higher School of Applied Physics and Space Technologies, Peter The Great St. Petersburg Polytechnic University

E-mail: lavrov@ice.spbstu.ru

E.Yu. Khvostov – Research Scientist, Institute of Applied Astronomy RAS (Saint Petersburg) E-mail: khvostovjenia@gmail.com