Figure 3-1. Atmospheric Absorption by the 1. 35-cm Line of Water Vapor for a Mean Absolute Humidity of 7. 75 g/m^ and by the 0. 5-cm Line of Oxygen at a Temperature of 20°C and a Pressure of One Atmosphere. After Bean and Dutton (1968). integrated zenith attenuation as shown by the curves in Figure 3-2, due to Crane and reproduced from reference (2). There is little variation in attenuation below 10 GHz between the extremes of a totally dry and saturated atmosphere. The curve labeled M corresponds to a representative model atmosphere for summer conditions at a temperate latitude. The estimates of molecular absorption for power transmission are based on this result, but scaled by the cosecant of the
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