1. Institute for Scientific Research; Boston College; Chestnut Hill Massachusetts USA
2. Haystack Observatory; Massachusetts Institute of Technology; Westford Massachusetts USA
3. Institute of Solar-Terrestrial Physics RAS; Irkutsk Russian Federation
4. Air Force Research Laboratory/VSBX; Hanscom AFB Massachusetts USA
5. Max-Planck-Institut für Aeronomie; Lindau Germany
6. Kyushu University; Fukuoka Japan
7. Institute of Ionosphere NAS&ME; Kharkov Ukraine
8. Applied Physics Laboratory; Johns Hopkins University; Laurel Maryland USA
9. Los Alamos National Laboratory; Los Alamos New Mexico USA