Fig. 2.
Collision velocities calculated from Eq. (12) in the space of the sizes of the collision partners. The turbulent velocity vg and the constant cd, which describes the speed of the ion-neutral drift (see Eq. (5)), are different in each panel, as labeled. The isothermal sound speed cs is given by 
. The labeled contours are at 1, 10, and 50 m per sec.
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