4. CONCLUSIONS
During the reporting period (1992-2001), the CN Tower
current measurement system recorded a total of 160
lightning flashes, containing 508 current impulses (current
impulses having wavefront peaks lower than 2 kA have
not been used or counted in the analysis). The
overwhelming majority of these flashes, 156 out of 160,
were negative. Only two 3-stroke bipolar flashes, each
containing one positive stroke, and two single-stroke
positive flashes were recorded.