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0.0
210.0
2
120 km
116 km
20.0
2
30.0
240.0
2
50.0
260.0
2
70.0
280.0
0.0
210.0
112 km
108 km
220.0
230.0
2
40.0
250.0
2
60.0
270.0
2
80.0
0.0
210.0
104 km
100 km
220.0
230.0
2
40.0
250.0
2
60.0
270.0
2
80.0
10
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10000 10
100
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10000
Frequency (Hz)
Figure 10.27
Six electric field spectra spaced 4 km apart as a rocket descended through
the electrojet. The spectra each represent 1.092 s of data. [After Pfaff et al. (1984). Repro-
duced with permission of the American Geophysical Union.]
Most rocket measurements, including those shown here, emphasize waves with
λ
≤
tens of meters. This is also true in the equatorial electrojet. This limitation
is due to the high velocity at which most rockets penetrate the E region. Like
the Condor experiments (see Chapter 4), the
Auroral-E
rocket experiment was
dedicated to low-altitude studies and thus the rocket spent more time in the
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