Results of the Global VLF-Atmospherics Analyser Network

A worldwide network of 8 stations has been established to observe the sferics activity in the lower VLF range. The stations are equipped with a VLF-Atmospherics-Analyser which provides automatic facilities for directional rates measurements and for single-station localizing. Monthly mean values of sferics rates as functions of the azimuth and of daytime for different stations are shown and discussed. A comparison between meteorological storm data and storm locations obtained by the single station technique demonstrated the influence of the day-night boundary on the location method and yielded possibilities to consider diurnal and seasonal variations. To complete the network in order to get a global coverage, a few more stations, positioned about 5 Mm east of the main storm regions, would be necessary. These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.