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In this paper, a novel procedure to reconstruct the lightning channel-base current starting from the measurement
of the induction field generated by it is presented. The procedure is based on a suitable mathematical manipulation of the
equation expressing the induction field in the time domain, in order to transform it into a Volterra-like integral equation.
Such kind of equations can be easily numerically solved without resorting to any sort of regularization techniques as they
are not affected by the typical ill-conditioning of the inverse problems. The developed algorithm has been validated by
means of several numerical simulations, which have shown its effectiveness also in presence of measurement noise on the
induction field values.