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Porcupine II - E
5 54 mV/m NW
130
120
110
100
90
1000
10000
100000
-10
0
10
Electron density, cm
-3
mV/m
Porcupine IV -
E
5
65 mV/ m S
130
120
110
100
90
-10
0
10
Log relative
electron density
mV/m
Figure 10.33
Wave electric field and fixed-bias Langmuir probe data from the traver-
sal of the
Porcupine II
and
Porcupine IV
payloads through the electrojet region. The
Porcupine II
experiment was conducted during a northward electric field, whereas
the
Porcupine IV
experiment was flown in the presence of a southward electric field.
The solid line in the left-hand panel shows the density profile. The density decreases are
due to probe end effects. [After Pfaff et al. (1984). Reproduced with permission of the
American Geophysical Union.]
a nonzero attenuation will occur for wave electric fields. The parallel attenu-
ation length resulting from the mapping of an electric field perpendicular to the
magnetic field may be approximated by
λ
||
=
(σ
0
/σ
P
)
+
1
/
2
λ
⊥
(10.22)
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