[Ips-dhfpr] ASWFC Daily HF Prop Report - 09 May 25 issued 2331 UT on 09 May 2025 [SEC=OFFICIAL]

Australian Space Weather Forecasting Centre aswfc at bom.gov.au
Sat May 10 09:31:06 AEST 2025


SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/09 MAY 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (09 MAY) 
Date   T index  Conditions    
09 May    98    Normal-fair    

Flares: none.

MUFs:
   Cocos Island Region:
      Near predicted monthly values.
   Niue Island Region:
      Near predicted monthly values during local day.
      Depressed by 30% during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 25% during local night.
   Southern Australian Region:
      Mostly near predicted monthly values.
      Depressed by 25% after local dawn.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 15% over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Apr      123
May      113
Jun      111


2. FORECAST (10 MAY - 12 MAY)
Date   T index  Conditions       MUFs                              
10 May    95    Normal-fair      Near predicted monthly values/depressed 
                                 10 to 15%
11 May   100    Normal           Near predicted monthly values    
12 May   100    Normal           Near predicted monthly values   

COMMENT: ASWFC HF Communications Warning 45 was issued on 7 May 
and is current for 8-10 May. Maximum usable frequencies (MUFs) 
in the Australian region on UT day 09-May were near predicted 
monthly values to 25% depressed during local night. Spread F 
was observed at Hobart and Canberra during local night hours. 
MUFs are expected to be mostly near predicted monthly values 
over 10-12 May, with further depressions possible on 10-May. 
Minor shortwave fadeouts are possible.

----------------------------------------------------------
For an explanation of some of the terms in this report, go to
https://www.sws.bom.gov.au, and follow links to Educational->
Glossary on Solar Terrestrial Terms.

Australian Space Weather Forecasting Centre
Bureau of Meteorology
ASWFC at bom.gov.au
www.bom.gov.au | www.sws.bom.gov.au



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