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E
MS
J
MS
J
R
R
1
R
1
Dusk
Dawn
E
0
E
0
J
pc
E
0
E
0
E
pc
R
2
R
2
J
J
0
J
J
0
Auroral
zone
J
R
J
PR
E
M
J
T
(a)
Magnetospheric
convection
J
II
J
II
N
B
J
II
J
II
E
⊥
52
V
3
B
E
'
V
B
Diffuse aurora
E
⊥
52
V
3
B
V
Sun
(b)
Figure 8.2
(a) Schematic diagram of the currents and electric fields that exist as a result
of the extended magnetic field in the tail of the magnetosphere and the interaction between
the solar wind and the earth's magnetic field. (b) Three-dimensional view of the electric
and magnetic field geometry on auroral zone flux tubes.
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