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From: Eric on 6 May 2008 11:51 In assessing the high frequency content of any wave form, including a lighning pulse, the rise time is not significant. The actual calculation is based on the slew rate, or slope of the wave form. A lighning pulse of 1.2 microseconds has a slew rate of many thousands of amps per microsecond. That is why there is much high frequency content in a lightning pulse. Eric
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