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Greenland cusp 18 Dec 74
Altitude (km)
435
335
10
5
2
3
10
5
Electron density
5 3 10
4
10
4
2
3
10
1
Electron energy flux
10
0
10
21
10
22
540
550
560 570 580
Flight time in seconds
590
600
610
Figure 10.7
Simultaneous in situ measurements of electron density and precipitating
auroral energy flux in the polar cusp. [After Kelley et al. (1982a). Reproduced with per-
mission of the American Geophysical Union.]
Approximate wavelength
75 km
7.5 km
0.75 km
75 m
10
14
10
12
10
10
f
21.9
10
8
10
6
10
4
10
2
2
10
2
1
1
10
Frequency (Hz)
Figure 10.8
Spectrum of irregularities obtained from analysis of the electron density
measurements shown in Fig. 10.7. [After Kelley et al. (1982a). Reproduced with permis-
sion of the American Geophysical Union.]
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