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Thursday, December 31, 2015

IS THE "EL NINO" PHENOMENON AFFECTING HF RADIO PROPAGATION?

 
 
IS THE "EL NINO" PHENOMENON AFFECTING HF RADIO PROPAGATION?
 
Pre-sunrise propagation into Melbourne recently has revealed surprisingly strong signals on 15, 17, and 21 MHz, inconsistent with HF prediction indicators.
 
I am starting to think that this may be linked to El Niño, which refers to the extensive warming of the central and eastern tropical Pacific that leads to a major shift in weather patterns across the Pacific. El Niño events are often accompanied by cooler than normal sea surface temperatures (SSTs) in the western Pacific, and to the north of Australia.
 
This propagation is dominated by transmissions from Africa, Europe, and the Middle East reaching Melbourne via long path (over the Americas and the Pacific), and from the Americas via short path over the Pacific.
 
These examples indicate this weird propagation pattern as noted on Dec 30, 2015, in the time period 1700 to 1800.
 
15345 EGYPT English
15420 S. AFRICA BBC-Meyerton English
15435 S. ARABIA Arabic
15490 S. AFRICA AWR-Meyerton, Maaisi disalect
15580 BOTSWANA VOA English
 
17560 S. ARABIA Arabic
17655 USA VOA-Greenville Portuguese
17720 MADAGASCAR AWR-Talata Swahili to 17825*
17775 USA KVOH Spanish
 
21600 USA WHRI English
21675 USA WRMI English
 
 
 
 
 
 
 
 
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