Refractivity, Ft Worth, 18-19 Sep 57

Figure 3

Refractivity profiles at Ft. Worth, Texas, Carswell AFB,
11:30 p.m. September 18 and 5:30 a.m., September 19, 1957.
Note critical gradient of N for microwave ducting in the
vicinity of 6000 feet to 7000 feet altitude.

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