1. Crimean Astrophysical Observatory, Russian Academy of Sciences
2. Nizhny Novgorod State University of Architecture and Civil Engineering
3. Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radiowave Propagation, Russian Academy of Sciences
4. Voronezh State University
5. Radiophysical Research Institute, Lobachevsky Nizhny Novgorod State University
6. Schmidt Institute of Physics of the Earth, Russian Academy of Sciences
7. Kazan Federal University