An investigation of anomalous transhorizon radio wave propagation over irregular terrain
The anomalous nighttime propagation of radio waves was studied at frequencies of 9100, 2800, and 840 Mc/s observed on the 108-km path from Rochester to Ithaca, New York. Previously proposed theories that explain anomalous propagation by ducting, reflection, or diffraction fail to explain the irregular behavior studied. Further radio measurements in the form of (1) sampling the 9100-Mc/s signal at 15 sites located along the propagation path, (2) heightgain measurements at 9100 Mc/s at the receiver site, and (3) swinging the 2800-Mc/s antennas 2 deg off the great circle path were undertaken in order to arrive at an explanation of the phenomenon. Finally, a theory based on the formation of elevated superrefractive layers situated over two lakes crossing the path is proposed to explain the anomalous propagation. (Author).
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ANOMALOUS NIGHTTIME PROPAGATION ON
III EXPERIMENTAL INVESTIGATION OF ANOMALOUS
anomalous behavior Average Field Average Propagation Loss band Cayuga Lake circle path common horizon convective mixing correlation curvature Data sampled data were recorded daytime dew point diurnal diurnal variation downslope wind duct theory duct width elevated layers Elevation Profile explain the anomalous fading feet Figure 18 formation of elevated free space height gain hill hilltop Hourly Propagation Loss indicated interval inversion layer Ithaca Receiver Ithaca signal knife-edge diffraction layer above Cayuga layer above Seneca located Mc/s meteorological conditions mode of propagation modified refractive index nocturnal cooling observed occurs parabolic antenna partial duct propagation loss values propagation mode radio data radio measurements receiving antenna beam recorded at sites reflection coefficient refractive index gradient refractive layers rise in signal Seneca Lake shown in Figure signal behavior signal strength solar radiation super refractive terrain transmitter horizon trapped troposphere UHF SIGNAL values of propagation wavelength X band X-band signal