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On the origin of the lightning current oscillation measured at the Peissenberg Tower, Germany

机译：德国Peissenberg Tower测量雷电电流振荡的起源

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Lightning currents with high-frequency oscillations have been measured on the top of the Peissenberg Tower in Germany. In 2007, the tower top section was replaced by a smaller construction. After the replacement, the frequency of the oscillation changed from formerly ~12.5 MHz to MHz. The pulsation was less significant for the currents at lower tower sections and for the nearby electric and magnetic field (~190 m from the tower). Calculations revealed that the oscillation is caused by the transient response of the top structure of the tower. The presence of the tower increases the risetime of the fast rising currents and limits the maximum current steepness. This might be the reason, why the highest maximum current steepness ever recorded did not exceed the value of 155 kA/μs.
机译：在德国Peissenberg塔的顶部测量了具有高频振荡的闪电电流。 2007年，塔顶部分被较小的结构取代。更换后，振荡的频率从以前的〜12.5 MHz变为MHz。脉动对于较低塔部分的电流和附近的电磁场（距离塔）的电流不太重要。计算揭示了振荡是由塔顶结构的瞬态响应引起的。塔的存在增加了快速上升电流的立励，并限制了最大电流陡度。这可能是原因，为什么记录的最高最大电流陡度没有超过155ka /μs的值。

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