1. a Évora Geophysics Centre (CGE), University of Évora , Rua Romão Ramalho 59, 7000, Évora, Portugal
2. b Institute of Atmospheric Sciences and Climate (ISAC-CNR) , Via Gobetti 101, 40129, Bologna, Italy
3. c Department of Physics , University of Évora , Rua Romão Ramalho 59, 7000, Évora, Portugal