[Ips-dhfpr] ASWFC Daily HF Prop Report - 04 December 25 issued 2330 UT on 04 Dec 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/04 DECEMBER 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (04 DECEMBER) 
Date   T index  Conditions    
04 Dec    72    Normal-fair    

Flares    Max     Fadeout    Freq.  Sectors
  M6.0    0250UT  probable   lower  E. Asia/Aust.

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

PCA Event : No event.

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


2. FORECAST (05 DECEMBER - 07 DECEMBER)
Date   T index  Conditions       MUFs                              
05 Dec    85    Normal           Depressed 10 to 15%/near predicted 
                                 monthly values
06 Dec   100    Normal           Near predicted monthly values    
07 Dec   105    Normal           Near predicted monthly values   

COMMENT: Maximum usable frequencies (MUFs) in the Australian 
region on UT day 4-Dec were near predicted values to 15% depressed. 
Sporadic-E was observed in Brisbane and Canberra during local 
night hours. Spread-F was observed in Hobart. MUFs are expected 
to mostly near predicted values over 5-7 Dec, mildly depressed 
at the beginning of the period but improving by 6-Dec. Nighttime 
sporadic-E is expected.

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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