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12
Atmosphere explorer - C
RPA drift meter
Orbit 5595 Day 75048
Northern Hemisphere
18
6
X
Z
24
2.0
1.0
0
21.0
2
2.0
2.0
1.0
0
2
1.0
22.0
6
5
4
3
AB
CD
22:47
18.7
54.1
22:49
19.3
59.1
22:51
20.2
63.3
22:53
21.4
66.3
22:55
23.0
67.6
22:57
0.5
67.0
22:59
1.7
64.6
23:01 UT (hr : min)
2.8 MLT (hr)
60.6 ILAT (deg)
Figure 9.5
Plasma velocity and density data from AE-C showing that the midlatitude
trough begins to form in a region where the plasma moves eastward but at a speed less
than corotation. This region is labeled B. [After Spiro et al. (1978). Reproduced with
permission of the American Geophysical Union.]
In the region east of the terminator, the plasma is in continuous darkness and,
as is the case here, the equatorward edge of the high-latitude convection region
is frequently collocated with a region of depleted density, which usually has a
sharp poleward edge and a more gradual decline at its equatorward side. The
total plasma concentration depletion can exceed an order of magnitude in the
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