Radio Waves and Communications Distance
The height may be from 130 to 260 miles above earth. This can be compared to the E layer (see Fig. 3). The F layer may split into two layers during the daytime. If this happens, the weaker, lower layer is called Fl. It is about 100 miles high and acts somewhat like the E layer. The upper F layer (F2) remains the useful one for long-
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