Finite element modeling of the vertical and horizontal electric field signatures in the presence of a sprite

Recently Pasko Barrington-Leigh, and Inan have discussed models explaining the electromagnetic and optical behavior of sprites. Research presented herein extends Baginski´s lightning transient model by including Pasko´s self-consistent conductivity model for parameters consistent with sprite observations. Equations are solved simultaneously in differential form (Maxwell´s equations and electron ionization). Cylindrical symmetry is assumed and fields simulated at radius /spl sim/ 0-50 km, and altitude /spl sim/ 40-80 km. Vertical and horizontal field signatures are presented and anomalous behavior discussed. The research differs from earlier models by including the low altitude conductivity in the solutions and over the entire region simulated.