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This Concept Map, created with IHMC CmapTools, has information related to: RADAR Contamination, Ground Clutter causes non-meterological echo, Anomalous propogation (AP) when atmosphere bends beam back into earth, Ground Clutter occurs at ranges, ranges may be near the antenna, Superrefraction results in radar reporting echo at higher than actual altitude, Anomalous propogation (AP) caused by Atmospheric refraction, Ducting results in up to 5x normal RADAR distance, ranges may be at great distances, Ducting results in radar reporting echo at higher than actual altitude, Ground Clutter occurs when RADAR picks up EM wave it didn't send, beam strikes large moving objects eg: large flock of birds, Superrefraction results in up to 2x normal RADAR distance, at great distances caused by mountain ranges, EM in Sunlight may be Sunrise Spike, Subrefraction results in radar reports echo at lower than actual altitude, RADAR Contamination major types are Anomalous propogation (AP), Atmospheric refraction types are Superrefraction, RADAR Contamination major types are Ground Clutter, exaggerated non-meterological echos produced because solid objects fill greater portion of beam, Ground Clutter appears as exaggerated non-meterological echos