1. Royal Meteorological Institute of Belgium
2. Observatori de l’Ebre, CSIC – Universitat Ramon Llull, Roquetes, Spain
3. Institute of Earth Physics and Space Science, Sopron, Hungary
4. National Observatory of Athens
5. Institute of Atmospheric Physics of the Czech Academy of Sciences
6. Istituto Nazionale di Geofisica e Vulcanologia, Rome, Italy
7. University of Massachusetts Lowell
8. Borealis Global Designs Ltd., Varna, Bulgaria
9. SpacEarth Technology, Rome, Italy
10. Leibniz-Institute of Atmospheric Physics, Kühlungsborn, Germany
11. Observatori del Ebre
12. Istituto Nazionale di Geofisica e Vulcanologia