1. Institute for Astronomy, Astrophysics, Space Application and Remote Sensing (IAASARS), National Observatory of Athens, 11810 Athens, Greece
2. Department of Physics, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
3. Department of Physics, Section of Environmental Physics-Meteorology, National and Kapodistrian University of Athens, 10679 Athens, Greece
4. Department of Environment, Land and Infrastructure Engineering, Politecnico di Torino, 10121 Turin, Italy
5. School of Marine and Atmospheric Sciences, Stony Brook University, New York, NY 11794-5000, USA