Observed Atmospheric Structure Causing Degraded Microwave Propagation in the Great Lakes Area
01 January 1986
Measurements of microwave fading and meteorology in northern Indiana in 1984 and 1985 show heavy multipath fading in the 4-GHz band during the summer months. When a high pressure cell was present, a combination of shallow subrefraction on top of shallow ducting was observed from time to time, and multiple extreme superrefraction structures (or ducting) also occurred occasionally. These boundary layer structure anomalies are formed by thin layers of subsiding dry air associated with a high pressure center. Typical synoptic weather conditions causing this structural anomaly are discussed.