Some Meteorological Effects on Scattered Radio Waves

The long term variations of received scattered fields due to atmospheric effects are estimated for frequencies of 100 to 50,000 Mc and over propagation paths of 100 to 1000 miles. The long term variations are presented in two parts: (1) empirically derived variations excluding absorption and (2) theoretically derived variations due to gaseous atmospheric absorption. The absorption effects are obtained by following a scattered radio wave through an actual atmosphere.