Spatial and temporal analysis of lightning impacts over Greece - Matsangouras, I. T.; Nastos, P. T.; Zacharopoulos, K (COMECAP2014–ebook of contributions, edited by: Kanakidou, M., Mihalopoulos, N., and Nastos, P., Proceedings 12th International Conference of Meteorology, Climatology and Physics of the Atmosphere, Greece, Crete University Press, 2014)