TIME IN DAYS 10,000; 200 100 X x 70 50 — N 30 X \X 20 Io140 240 HEIGHT IN KILOFEET | 260 _ 280 Fig, 4 -- Time versus height for particles injected at 305 kilofeet. These curves were computed using equation (11). The number above each curve is the mass of the impurity particles in atomic units and the density of the impurity particles was assumed to be 6.4 gm/cm?”. Other input conditions were m = 28.97 atomic units, a= 1.70 x 1078 cm, p= 1.72 x 1079 em/cm® at 100 kilofeet, and T = 245°K.