Geoscience Reference

In-Depth Information

a

z

1

y

x

v/m

60.0

34.3

24.4

17.0

b

11.6

z

7.52

y

1

4.52

x

2.30

0.655

0

Fig. 5.21
Spatial distributions of electric field at the bottom border of the ionosphere after 1 ms

(
a
)andafter10ms(
b
) from the moment of the beginning of the lightning discharge

Thus, numerical modeling has confirmed that at the accounting of the finite

conductivity of the space between the ionosphere and the cloud in the zone with a

radius of about 100 km, the electric field after lightning discharge is retained during

tens of milliseconds.

5.3.2

Appearance of the Plasma Layer on the Bottom Border

of the Ionosphere

An excess of the electric field over the critical value by several times at the altitudes

of 70-90 km, arising after the lightning discharge, causes quick ionization in

this zone. We carry out research of this process by numerical modeling in one

dimension (1D), using data about the electrical conductivity of the atmosphere

already obtained, and the expressions of Eq.
5.19
for modeling description of the

initial field distribution of the storm cloud over altitude, which scheme is submitted

in Fig.
5.14
.

The dynamics of the process is described by the system of Eq.
5.24
,where

designations are entered by Eq.
5.25
. Rate constants of the dissociative attachment