Lightning currents measured on the Säntis Tower: A summary of the results obtained in 2010 and 2011

The deployed instrumentation at the Säntis Tower in Switzerland to measure lightning currents and lightning current derivatives is presented. During the first 18 months of operation, the measurement system successfully recorded more than 200 flashes to the tower. 15% of the recorded flashes (namely 30) were of positive polarity, and 1.5% (3 flashes) were bipolar. We also present a summary of the statistical data obtained so far for the salient parameters of the currents associated with upward negative and positive flashes.