Andreotti, AmedeoRachidi, FarhadVerolino, Luigi2015-10-132015-10-132015-10-13201510.1109/TEMC.2015.2434771https://infoscience.epfl.ch/handle/20.500.14299/119795WOS:000363189200019A rigorous formula representing the counterpart of the Cooray-Rubinstein expression in the time domain has recently been derived by the authors. In this paper, the formula is particularized for the cases of a unit step and a linearly rising channel-base current, waveforms frequently used in lightning performance studies. Furthermore, an approximate kernel of the formula is also presented, allowing a very compact and straightforward solution for the case of linearly rising currents.Cooray-Rubinstein formulahorizontal electric fieldlightningtext::journal::journal article::research article