Surplus of negative charge flow in point-discharge current as shown by variations on different time scales at Nagycenk station

Details Surplus of negative charge flow in point-discharge current as shown by variations on different time scales at Nagycenk station Surplus of negative charge flow in point-discharge current as shown by variations on different time scales at Nagycenk station

Oct 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jastp..60.1435m&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 60, Issue 15, p. 1435-1443.

Physics

1

Scientific paper

Data of point-discharge current measurements at the Nagycenk station covering more than three decades have been used for demonstrating the variations of this atmospheric electric parameter on different time scales. The diurnal variation of the point-discharge current shows an early morning minimum and an afternoon maximum as represented by charges brought down to ground by a metal point (elevated to a height of about 8 m), and this is valid for charges of both signs. On the diurnal time scale, there is a surplus of negative charge flow which peaks in the afternoon. A predominance of negative charge flow was also found on the annual time scale as indicated by the monthly mean values of transported charges of both signs. The monthly mean ratio of negative to positive charge is well above 1.0 from April to October and it is below 1.0 merely in the first three months of the year. Determining an average ratio of negative to positive charge for each individual year between 1961 and 1996, it was shown that the yearly average ratio is usually above 1.0 (except for 4 years). Some comparisons between results of Nagycenk and those obtained simultaneously at other stations showed a certain agreement; however, they also revealed discrepancies between individual values of the transported charges. Notwithstanding, a surplus of negative charge flow was detected even by these comparisons. The results derived on different time scales do confirm that point-discharge current plays an important role in the transfer of charges to the Earth; at the same time a predominance of negative charge flow could be proved.

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