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This Concept Map, created with IHMC CmapTools, has information related to: RADAR Contamination, RADAR Contamination major types are Ground Clutter, Ground Clutter causes non-meterological echo, Ground Clutter occurs at ranges, EM in Sunlight may be Sunset spike, Ground Clutter occurs when beam strikes large moving objects, exaggerated non-meterological echos produced because solid objects produce more energy, RADAR Contamination major types are Anomalous propogation (AP), Ground Clutter occurs when RADAR picks up EM wave it didn't send, Atmospheric refraction types are Superrefraction, beam strikes large moving objects eg: large flock of birds, Ducting results in up to 5x normal RADAR distance, Ducting results in radar reporting echo at higher than actual altitude, beam strikes large moving objects eg: large swarm 'of insects, RADAR picks up EM wave it didn't send eg EM in Sunlight, at great distances caused by mountain ranges, Ground Clutter occurs when beam strikes fixed object, Subrefraction results in radar reports echo at lower than actual altitude, ranges may be at great distances, exaggerated non-meterological echos produced because solid objects fill greater portion of beam, Superrefraction results in radar reporting echo at higher than actual altitude