| WG# | WG Title | Participants (Nr.) |
| 1 | Atm. electricity network | Kourtidis, Haralambous, Makela, Petaja, Bor, Barta, Yair, Price, Odzimek, Kubicki, Nicoll, Ushoshin, Kotroni, Matthews, Peralta-Menendez, Mareev, Satori, Donner, Mironova, Silva, Tourpali, Kosmidis, Kostarakis (23) |
| 2 | Natural radionuclides / ionosphere and connection with natural hazards | Tsenova, Haralambous, Makela, Petaja, Yair, Price, Bor, Odzimek, Kubicki, López, Barbosa, Voiculescu, Dragovic, Rosanov, Nicoll, Ushoshin, Lopes, Kotroni, Kaasik, Mironova, Donner, Markova, Onjia, Mareev, Vana, Amoiridis, Oikonomou, Haldoupis, Xuemeng Chen, Petrovic (30) |
| 3 | Climatic relevance | Rosanov, Tsenova, Pedersen, Makela, Petaja, Kourtidis, Bor, Barta, Yair, Price, Birsan, Barbosa, Voiculescu, Nicoll, Markova, Ushoshin, Matthews, Satori, Donner, Mironova, Mareev, Harrison, Silva, Ulanowski, Tourpali (25) |
| 4 | Biological aspects | Arroyabe, Consulas, Price, Peralta-Menendez, Matthews, Kourtidis, Apollonio, Cifra, Ferus, López-Jimenez, Mir, Crespo-Faccoro, Daniel, Elhalel, Vorenhout (15) |
| 5 | Instrumentation development | Nicoll, Makela, Odzimek, Kubicki, Kourtidis, van der A, Bennett, Mareev, Vana, Aplin, Hloupis, Stavrakas, Amoiridis, Ulanowski, Kostarakis, Votis, Vorenhout (17) |