STUDY OF THE AIR-EARTH ELECTRICAL-CURRENT DENSITY IN ATHENS

In the present study, we examine the daily and annual variation of the air-earth current density in Athens for all weather as well as for fair weather for a 16-year period 1965-1980. The daily variation of the air-earth current density has a definite bimodal form while the annual variation has no definitive form but simply reaches its larger values during the summer months. There has also been a Fourier analysis of the daily variation. Furthermore, and for a 3-year period 1968-70, we present the mean daily and annual variation of the electric field, air-earth current density and total conductivity of the air. Based on these parameters we have estimated the conduction and the convection current and we have correlated them to the total (measured) current. In addition, we have estimated the values of the OMEGA-parameter, in order to test the fulfillment of Ohm's law in atmosphere.