Institution: | 1. Institute of Terrestrial Magnetism, Ionosphere, and Radio Wave Propagation, Russian Academy of Sciences (IZMIRAN), Troitsk, Moscow Region 142190, Russia;2. Institute of Gravitation and Space Sciences, 71111 Bucharest, Romania;3. Space Research Center, Polish Academy of Sciences, 00-716 Warsaw, Poland;4. Institute of Atmospheric Physics, Academy of Sciences of the Czech Republic, 14131 Prague, Czech Republic;5. Institute of Experimental Physics, Slovak Academy of Sciences, 04001 Kosice, Slovakia;6. Nuclear Physics Institute, Academy of Sciences of the Czech Republic, ?e?, Czech Republic |