Geoscience Reference
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30
200
Day
E 0 = 0.5 V/m
γ = 1
Night
E 0 = 0.5 V/m
γ = 1
25
δ Σ H , left
150
δ Σ H , left
δ Σ P , left
20
δ Σ H , right
15
δ Σ P , left
100
10
δ Σ H , right
5
50
δ Σ P , right
0
δ Σ P , right
5
0
2
4
6
8
2
4
6
8
Frequency, MHz
Frequency, MHz
Fig. 13.6. The frequency dependencies of the relative disturbances of δΣ P (solid
and chain lines) and δΣ H (dashed and dotted lines) caused by a displacement of the
chemical equilibrium of the E -layer in the strong HF wave. The electric field of the
pump wave at the bottom ionosphere z =65kmis5V/m
effects here and restrict ourselves to estimates of the conductivity disturbances
obtained above.
Geomagnetic Variations
To estimate the magnitude of the artificial magnetic variations, we return
to the simple model of the circle inhomogeneity with Σ H 1 P 1 of radius a
considered in Chapter 10. The inhomogeneity is placed into a homogeneous
background current in the ionosphere with Σ H 0 P 0 . A magnetic perturba-
tion is caused by the perturbed ionospheric current (10.2). The radial b r and
azimuthal b ϕ magnetic components below such an inhomogeneity, are given
by [1]:
δb r = 2 a
{
[2 ρ 0 ( ρ 0 + ρ 1 )
]sin ϕ
2 ρ 0 ( δ 0
δ 1 )cos ϕ
}
1
r I (1 , 1 ,
I (1 , 0 , 0) ,
×
1)
2 a
{
δb ϕ =
[2 ρ 0 ( ρ 0 + ρ 1 )
]cos ϕ +2 ρ 0 ( δ 0
δ 1 )sin ϕ
I (1 , 1 ,
1) ,
(13.17)
where
Σ P 0 , 1
Σ P 0 , 1 + Σ H 0 , 1
Σ H 0 , 1
Σ P 0 , 1 + Σ H 0 , 1
ρ 0 , 1 =
,
δ 0 , 1 =
,
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