  The numerical simulation of an air spark gap has been carried within two
theoretical models. The kinetic one [1] allowed us to calculate time
dependencies for the residual resistance (0.2 - 0.4 Ohm for our selection of a
circuit parameters), the spark gap channel width, the electron number density,
the mobility, the conductivity, the ionization degree, the magnetic field in
the discharge channel, the channel inductance and the electron drift velocity.
Simulating a real circuit and taking into account a spark gap residual
resistance demonstrates good agreement of both models with the experimental
data, while that without taking into account this resistance overestimates the
maximal current in the circuit by approximately 5%.
