Preliminary Comparison of Data from the Säntis Tower and the EUCLID Lightning Location System
In this paper, direct lightning current measurements obtained on the Sntis Tower from June 1st, 2010 to May 31st, 2011 are used to evaluate the ability of the EUCLID lightning detection network to detect this type of lightning triggered by a tall tower in terms of detection efficiency, location accuracy and peak current estimates. The Sntis Tower is a 124-meter tall tower sitting on the top of the Sntis Mountain (2500 m) in Switzerland. The tower has been instrumented to measure waveforms of the lightning current and of its time derivative. In the considered period, 57 flashes were recorded at the Sntis Tower out of which 15 were of positive polarity. The data have been correlated to EUCLID data by comparing the time-stamps provided by the GPS time references. The flash detection efficiency for negative flashes is estimated to be 93%. The median value of the location error is 126 m. The EUCLID peak current estimates were on average significantly larger than the measured current. The measurements include four typical positive flashes, which were successfully detected by EUCLID. The location errors for the positive events ranged from 1 to 3 km, with a median of 959 m.
Keywords: lightning detection ; Switzerland ; Positive polarity ; Time derivative ; Wave forms ; Peak currents ; Lightning protection ; Measured currents ; Location errors ; Median value ; Location accuracy ; Lightning location systems ; Lightning currents ; Direct lightning ; Detection efficiency ; tall tower ; positive flashes ; negative flashes ; lightning location ; Towers
Record created on 2011-09-07, modified on 2016-08-09