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4 0
2 0
0
2
2 0
D E - 2
M a y 3 , 1 9 8 2
S t a r t : 1 2 : 4 7 : 5 0
2
4 0
2
6 0
D r i f t s p e e d : 8 4 m / s 2 4 3 d e g r e e s
2
8 0
0 . 0
0 . 5
1 . 0
1 . 5
2 . 0
2 . 5
E s t i m a t e d t i m e ( h o u r )
2 0
5 0
F e b . 1 7 / 1 8 , 1 9 9 9
F e b . 1 7 / 1 8 , 1 9 9 9
0
0
2
2 0
2
4 0
2
5 0
2 1 . 5
2 2
2 2 . 5
2 3
2 3 . 5
2 4
2 1 . 5
2 2
2 2 . 5
2 3
2 3 . 5
2 4
2 0
F e b . 1 7 / 1 8 , 1 9 9 9
2 0
F e b . 1 7 / 1 8 , 1 9 9 9
0
0
2
2 0
2
2 0
2
4 0
2
4 0
2
6 0
2 5
2 5 . 5
2 6
2 6 . 5
2 7
2 5
2 5 . 5
2 6
2 6 . 5
2 7
1 0 0
1 5 0
F e b . 2 0 / 2 1 , 1 9 9 9
F e b . 2 0 / 2 1 , 1 9 9 9
1 0 0
0
5 0
2
1 0 0
0
2
2 0 0
2 2 . 5
2 3
2 3 . 5
2 4
2 4 . 5
2 2 . 5
2 3
2 3 . 5
2 4
2 4 . 5
L T ( h r s )
L T ( h r s )
Figure 6.27a
Eastward plasma drift velocity estimated with the electric field observation
by DE-2 (top panel) and the average drift velocity of airglow features (three left-hand side
panels) measured by the Arecibo radar during the nights of February 17-18 and 20-21,
1999.
V
pe
is shown in the left-hand panels and
V
pn
is on the right.
V
pe
is to be compared
to the DE data. [After Kelley et al. (2000c). Reproduced with permission of the American
Geophysical Union.]
fields measured on the DE satellite and found a band of large electric fields at the
poleward edge of the anomaly region (Fig. 6.27a, b). These fields were compared
to Arecibo observations and found to be similar (Fig. 6.26a).
Figure 6.28a provides further indication as to what is occurring. Here the radar
observations have been used to calculate the local F-region Pedersen conductivity
(
σ
PF
and the
airglow emission are very similar, as is evident from the two plots. Notice that
the uplifted region has a very low
σ
PF
) and the airglow expected from an event. The equations for
σ
PF
and that it is also a low-airglow zone.
We wish to point out that, although low airglow can be produced simply by
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