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Zonal wind (m/s
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Meridional wind (m/s
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Figure 5.25a
Superposition of numerous wind measurements using TMA trails. [After
Larsen (2002). Reproduced with permission of the American Geophysical Union.]
the billows seen in the sodium near 23 LT. These neutral instabilities in turn
can create structure in the collision-dominated ions (see Chapter 6). The down-
ward streaks in the sodium are very related to the progression of the tidal ion
layers operating in conjunction with sodium and sodium ion chemistry (Collins
et al., 2002).
The double trail at low altitudes is a fascinating phenomenon that may be due
to a vortex train left by rising hot ablation gases (Zinn and Drummond, 2005) or
a combination of a buoyant gas trail and a falling dust trail (Kelley et al., 2003).
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