1. Dipartimento di Fisica E. Amaldi; Università “Roma Tre,”; Rome Italy
2. Institute of Terrestrial Magnetism, Ionosphere and Radiowave Propagation (IZMIRAN); Russian Academy of Science; Troitsk Russia
3. St. Petersburg Filial Institute of Terrestrial Magnetism, Ionosphere and Radiowave Propagation (SPb FIZMIRAN); Russian Academy of Science; St. Petersburg Russia
4. Israel Cosmic Ray Center; Tel Aviv University and Israel Space Agency; Tel Aviv Israel