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7
B
y
.
0
6
5
4
3
2
1
0
0
1.0
Solar wind electric field (mV/m)
2.0
3.0
7
B
y
,
0
6
5
4
3
2
1
0
0
1.0
2.0
3.0
Solar wind electric field (mV/m)
B
y
+
Figure 8.27
Region 1 currents plotted against the solar wind electric field
[
V
sw
(
B
z
)
1
/
2
sin
0. The Region 1 currents show a dependence on
the solar wind electric field similar to that of the polar cap potential drop. Notice that
the Region 1 currents do not reduce to zero when the solar wind electric field does,
possibly indicating a viscous interaction. [After Iijima and Potemra (1982). Reproduced
with permission of the American Geophysical Union.]
(θ/
2
)
]
for
B
y
>
0 and
B
y
<
vertically down directions and are denoted by
H
D
, and
Z
components, respec-
tively. Sometimes a geomagnetic coordinate system is used, in which case the
symbols
X
,
Y
, and
Z
denote the magnetic perturbations. It is impossible to
derive the true horizontal ionospheric current distribution uniquely from ground
,
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