Geoscience Reference
In-Depth Information
Fig. 5.17
Area of the electric field overcriticality after lightning discharge of the storm cloud
Fig. 5.18
Geometry of the problem formulation at modeling of electromagnetic field dynamics in
the vicinity of a storm cloud during slow charging of the cloud and in time after lightning discharge
current in the lightning channel, equal to 13 kA. The discharge current in the
lightning channel has a duration of about 0.5 ms.
In Fig.
5.20
the time dependence of the electric field above the cloud for various
values of altitude is depicted.
Although the lightning discharge is finished during a time less than 1 ms, and
the generation of the electromagnetic dipole radiation has finished, the electric field
above the cloud under the ionosphere at all altitudes continues to exist during tens of
milliseconds. This polarization field is caused by the separation of charges during
the slow charging of the cloud. The electromagnetic wave, which has brought its
contribution to the maximum of the field above the cloud, diverges radially in the
waveguide channel, formed by ground and ionosphere, having left a zone with a
