Analysis of long-term variations in fair-weather PG, the positive air conductivity and conduction current density at Geophysical Observatory in Świder, Poland, and implications for the Global Electric Circuit

The ground-level potential gradient atmospheric electric field, the air conductivity, and concentration of cloud condensation nuclei have been recorded at Stanislaw Kalinowski Geophysical Observatory in Świder, Poland (52°07' N, 21°14' E), for several decades. A new digitisation project of Świder atmospheric electric data published in the observatory year books provides an opportunity to review the results of studies of the long-term variation of the electric parameters. New results of an analysis of both short-term and long-term variations in the positive conductivity and related component of the air-Earth current density are presented, and implications for the Global Electric Circuit studies using the Świder dataset are discussed. This work is supported by Poland National Science Centre grant no 2021/41/B/ST10/04448.