Electromagnetic Effects Resulted from Explosions - Ultra and Extremely Low Frequency Electromagnetic Fields - page 445

E z , V/m

250

2

t , s

0

5 10

1

-250

Fig. 11.9 Vertical electric field arising in the surface atmospheric layer under a cratering explosion
of HE with mass 23.8 g. The explosion was performed at normalized depth 0.68 m/kg 1=3 . 1 —
theoretical calculations, 2 —measurements at distance 5.2 m from the explosion site. Adapted from
Adushkin et al. ( 1990 )

3000

E z , V/m

2500

2000

a

1500

1000

b

500

c

t , s

0

0 100 200 300 400 500 600 700 800 900

Fig. 11.10 Variations of vertical electric field caused by the HE explosion with mass 500 t as
observed at different distances R from the explosion site (Soloviev and Surkov 2000 ). ( a ) R D

1:5 km; ( b ) R D 2 km; ( c ) R D 1:5 km (model calculation)

and experimental data at the moment 40 s corresponds to the following parameters:
q 1 D 1:3 ˙ 0:1 C, h 1 D 1:39 ˙ 0:06 km, q 2 D 0:4 ˙ 0:1C, and h 2 D 0:30 ˙ 0:06 km.
A series of surface detonations of HE charges with mass of a few kilograms were
carried out by Soloviev et al. ( 2002 ). The study showed that the amplitude of the