abnormal propagation

abnormal propagation

[ab′nȯr·məl ‚präp·ə′gā·shən]
(communications)
Phenomena of unstable or changing atmospheric or ionospheric conditions acting upon transmitted radio waves, preventing such waves from following their normal path, thereby causing difficulties and disruptions of communications.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Nine (28%) of the patients showed abnormal propagation of esophageal waves (Figure 3).