1. Center for Atmospheric and Space Sciences; Utah State University; Logan Utah USA
2. Radio Observatorio de Jicamarca; Instituto Geofisico del Peru; Lima Peru
3. Helmholtz Centre Potsdam; GeoForschungsZentrum; Potsdam Germany
4. Haystack Observatory; Massachusetts Institute of Technology; Westford Massachusetts USA
5. Space Environment Research Center; Kyushu University; Fukuoka Japan
6. Applied Electromagnetic Research Center; National Institute of Information and Communications Technology; Tokyo Japan