[Ips-dhfpr] ASWFC Daily HF Prop Report - 03 December 25 issued 2330 UT on 03 Dec 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/03 DECEMBER 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (03 DECEMBER) 
Date   T index  Conditions    
03 Dec   122    Normal-fair    

Flares: none.

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Enhanced by 20% during local night.
      Enhanced by 30% after local dawn.
   Niue Island Region:
      Near predicted monthly values during local day.
      Enhanced by 15% during local night.
   Northern Australian Region:
      Enhanced by 15% during local day.
      Enhanced by 25% during local night.
      Depressed by 20% after local dawn.
   Southern Australian Region:
      Mostly near predicted monthly values.
      Depressed by 20% after local dawn.
   Antarctic Region (Casey/Davis/Mawson):
      Near predicted monthly values over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Nov      103
Dec      89
Jan      89


2. FORECAST (04 DECEMBER - 06 DECEMBER)
Date   T index  Conditions       MUFs                              
04 Dec    70    Fair             Depressed 15 to 20%/near predicted 
                                 monthly values
05 Dec    80    Fair-normal      Depressed 10 to 15%/near predicted 
                                 monthly values    
06 Dec    90    Normal-fair      Near predicted monthly values   

COMMENT: ASWFC SWF HF Communications Warning 114 was issued on 
2 December and is current for 2-4 Dec. ASWFC HF Communications 
Warning 115 was issued on 3 December and is current for 4 Dec 
only. Maximum usable frequencies (MUFs) in the Australian region 
on UT day 03-Dec were near predicted monthly values to 15% enhanced 
during the local day yesterday, then becoming depressed by 20% 
after local dawn this morning following overnight geomagnetic 
activity. Spread F was observed at Hobart during local night 
hours. MUFs are expected to be 15-20% depressed for 04-Dec and 
10-15% depressed on 05-Dec. Shortwave fadeouts are possible on 
daylight HF circuits.

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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