B Fastrup (Aarhus U.), E Pedersen (Aarhus U.), E Lillestol (Bergen U.), M Bosteels (CERN), A Gonidec (CERN), J Kirkby (CERN), S Mele (CERN), P Minginette (CERN), B Nicquevert (CERN), D Schinzel (CERN), W Seidl (CERN), P Grundsoe (Danish Space Res. Inst.), N Marsh (Danish Space Res. Inst.), J Polny (Danish Space Res. Inst.), H Svensmark (Danish Space Res. Inst.), Y Viisanen (Finnish Meteorological Inst.), K Kurvinen (Helsinki Inst. of Phys.), R Orava (Helsinki Inst. of Phys.), K Hameri (Helsinki U.), M Kulmala (Helsinki U.), L Laakso (Helsinki U.), CD O'Dowd (Helsinki U.), V Afrosimov (Ioffe Phys. Tech. Inst.), A Basalaev (Ioffe Phys. Tech. Inst.), M Panov (Ioffe Phys. Tech. Inst.), A Laaksonen (Kuopio U.), J Joutsensaari (Kuopio U.), V Ermakov (Lebedev Inst.), V Makhmutov (Lebedev Inst.), O Maksumov (Lebedev Inst.), P Pokrevsky (Lebedev Inst.), Y Stozhkov (Lebedev Inst.), N Svirzhevsky (Lebedev Inst.), K Carslaw (Leeds U.), Y Yin (Leeds U.), T Trautmann (Mainz U., Inst. Phys.), F Arnold (Heidelberg, Max Planck Inst.), KH Wohlfrom (Heidelberg, Max Planck Inst.), D Hagen (Missouri U., Rolla), J Schmitt (Missouri U., Rolla), P Whitefield (Missouri U., Rolla), K L Aplin (Reading U.), RG Harrison (Reading U.), R Bingham (Rutherford), F Close (Rutherford), C Gibbins (Rutherford), A Irving (Rutherford), B Kellett (Rutherford), M Lockwood (Rutherford), JM Makela (Tampere U. of Tech.), D Petersen (Vienna U.), WW Szymanski (Vienna U.), PE Wagner (Vienna U.), A Vrtala (Vienna U.)