[1] Austrian Acad Sci, Space Res Inst IWF, Graz, Austria
[2] Graz Univ, Inst Geophys & Meteorol IGAM, A-8010 Graz, Austria
[3] Observ Paris, F-75014 Paris, France
[4] European Sci Fdn, Standing Comm Phys & Engn Sci, Strasbourg, France
[5] CNRS UJF, Lab Planetol Grenoble, Grenoble, France
[6] Univ Bordeaux, Bordeaux, France
[7] Russian Acad Sci, Inst Astron INASAN, Moscow, Russia
[8] Osservatorio Astron Padova INAF, Padua, Italy
[9] Univ Vienna, Inst Astron, A-1180 Vienna, Austria
[10] Observ Paris LESIA, Paris, France
[11] European Space Agcy, Estec, Noordwijk, Netherlands
[12] ASTRON, Dwingeloo, Netherlands
[13] ETH, Zurich Astrophys Inst Astron, Zurich, Switzerland
[14] Inst Astrofis Canarias, Tenerife, Spain
[15] Finish Meteorol Inst, Helsinki, Finland
[16] Ukrainian Acad Sci, Inst Radio Astron Kharkov, UA-252601 Kiev, Ukraine
[17] Russian Acad Sci, Space Res Inst IKI, Moscow, Russia
[18] Russian Acad Sci, PGI, Murmansk, Russia
[19] NI Lobachevsky State Univ, Nizhnii Novgorod, Russia
[20] Chalmers, Onsala Space Observ, S-43900 Onsala, Sweden
[21] Univ Gottingen, Inst Astrophys, Gottingen, Germany
[22] Inst Estudis Espacials Catalunya, Barcelona, Spain
[23] Astrium Ltd, Stevenage, Herts, England
[24] Hebrew Univ Jerusalem, Jerusalem, Israel
[25] INAF Osservatorio Astron Torino, Turin, Italy
[26] Univ Kiel, Inst Theoret Phys & Astrophys, Kiel, Germany
[27] Swedish Inst Space Phys, S-98128 Kiruna, Sweden