Temperature Effects on Anomalous Radio Duct Propagation in Korean Coastal Area

Yong-Ki KWON  Man-Seop LEE  Hakyong KIM  

Publication
IEICE TRANSACTIONS on Communications   Vol.E93-B   No.3   pp.784-787
Publication Date: 2010/03/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E93.B.784
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Antennas and Propagation
Keyword: 
radio duct,  duct propagation,  critical temperature,  super refraction,  

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Summary: 
Atmospheric radio ducts can trap VHF/UHF radio waves and propagate them over long distances. 284.4625 MHz Japanese radio wave signal measurements show that the radio waves are propagated to Korea coastal regions when ground temperatures exceed 10C. This paper discusses the reasons for the existence of this critical temperature threshold.