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200
N
2
·O
O
2
O
2
150
NO
1
Air
1
N
1
O
2
O
3
100
N
1
O
1
2
Lyman
50
0
50
100
150
200
250
300
Wavelength (nm)
Figure 2.1a
Depth of penetration of solar radiation as a function of wavelength. Alti-
tudes correspond to an attenuation of 1
e
. The principal absorbers and ionization limits
are indicated. [After Smith and Gottlieb (1974). Reprinted with permission of Kluwer
Academic Publishers.]
/
1
Solar radiation
10
21
Solar
flare
Ly
10
22
3B
10
23
10
24
Active
sun
10
25
Quiet
sun
10
26
10
27
10
28
Corona
Photosphere
10
29
10
21
10
10
2
10
3
10
4
10
5
10
6
1
Wavelength (nm)
Figure 2.1b
Spectral distribution of solar irradiance and its variation with solar activity.
The logarithmic representation emphasizes the contribution of x-rays and extreme ultra-
violet radiation. [After Smith and Gottlieb (1974). Reprinted with permission of Kluwer
Academic Publishers.]
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