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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