The peak time is the time at which the maximum signal amplitude is observed at a particular location. The peak time observed in Fig. 55 (a) can be dervied by setting the time derivative of the analytic solution for \(E_x\) to zero. Where:
is the quasi-static analytic solution, the peak time is given by:
For an impulse excitation, the peak time is proportional to the square of the distance traveled.