Ré exion et transmission de l`ionosphère

1015 /m3
Ne= 1012 /m3
ω
γ(ω) = Nee2
meiω
div ~ E= 0
~
rot ~ E=−iωB
div ~ B= 0
~
rot ~ B=µ0γ(ω)~ E+µ00iω ~ E
~
E=~ E0exp i(ωt −kz)
k2=1
c2(ω2
−ω2
c)
ωc=sNee2
0me

~
E=~ E0exp i(ωt) exp(−
z
δ)
δ
δ=c
pω2
c
−ω2
˜n=ck
ω=r1−
ω2
c
ω2

0.0
0.2
0.4
0.6
0.8
1.0
0.0 0.5 1.0 1.5 2.0 2.5 3.0
f/fc
R
Incidence theta = 0

sin θt=n
TE
TM
0.0
0.2
0.4
0.6
0.8
1.0
0.0 0.5 1.0 1.5 2.0 2.5 3.0
f/fc
R
Incidence theta = 45
n < sin θ
f < fc
p1−sin2θ

1012/m3
n2= 1 −
f2
cm
f21−
4
h(z−
h
2)2
fcm
λc
h λc