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

机译：关于在德国Peissenberg塔测量的雷电流振荡的起因

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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雷电流。 2007年，塔顶部分被较小的结构所取代。更换后，振荡频率从以前的12.5 MHz变为MHz。对于塔下部的电流以及附近的电场和磁场（距塔约190 m），脉动的影响较小。计算表明，振动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上升时间，并限制了最大电流陡度。这可能是原因，为什么有记录的最大最大电流陡度没有超过155 kA /μs的值。

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