1. Sorbonne Universités UPMC Paris 06, LPP, Polytechnique Paris France
2. T/ICT4D Abdus Salam ICTP Trieste Italy
3. Department of Physics University of Lagos Lagos Nigeria
4. Department of Physics University of Tasmania Hobart Tasmania Australia
5. Laboratoire de Physique de l'Atmosphère Université Felix Houphouet Boigny Abidjan Côte d'ivoire