[1] CNR IMAA, Consiglio Nazl Ric, Ist Metod Anal Ambientale, Potenza, Italy
[2] Natl Tech Univ Athens, Dept Phys, Athens, Greece
[3] Max Planck Inst Meteorol, Hamburg, Germany
[4] Inst Tropospharenforschung, Leipzig, Germany
[5] Rijks Inst voor Volksgezondheid & Milieu, Bilthoven, Netherlands
[6] Univ Granada, Granada, Spain
[7] Aristoteleio Panepistimio, Thessalonikis, Greece
[8] Univ Potsdam, Math Inst, Potsdam, Germany
[9] Natl Acad Sci, Inst Phys, Minsk, BELARUS
[10] Univ Politecn Cataluna, Barcelona, Spain
[11] Swedish Def Res Agcy FOI, Linkoping, Sweden
[12] Polar Environm Ctr, Norwegian Inst Air Res, Tromso, Norway
[13] Ctr Suisse Elect & Microtech SA, CSEM, Neuchatel, Switzerland
[14] Natl Inst Res & Dev Optoelectron, Bucharest, Romania
[15] Univ Salento, Lecce, Italy
[16] Polish Acad Sci, Inst Geophys, Warsaw, Poland
[17] Ctr Invest Energet Medioambientales & Technol, Madrid, Spain
[18] EC Joint Res Ctr, Ispra, Italy
[19] Univ Paris 06, Inst Pierre Simon Laplace, Paris, France
[20] Univ Aquila, Dipartimento Fis, Laquila, Italy
[21] Ecole Polytech Fed Lausanne, Lausanne, Switzerland
[22] Consorzio Nazl Interuniv Sci Fis Mat, Naples, Italy
[23] Bulgarian Acad Sci, Inst Elect, Sofia, Bulgaria
[24] Forschungszentrum Karlsruhe, IMK IFU, Garmisch Partenkirchen, Germany
[25] Univ Munich, Munich, Germany