[Ips-dhfpr] ASWFC Daily HF Prop Report - 27 December 25 issued 2330 UT on 27 Dec 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/27 DECEMBER 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (27 DECEMBER) 
Date   T index  Conditions    
27 Dec   124    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M5.1    0150UT  possible   lower  West Pacific

MUFs:
   Cocos Island Region:
      No data.
   Niue Island Region:
      Near predicted monthly values.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 30% during local night.
   Southern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 20% during local night.
   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 (28 DECEMBER - 30 DECEMBER)
Date   T index  Conditions       MUFs                              
28 Dec   115    Normal           Near predicted monthly values 
                                 to 15% enhanced
29 Dec   115    Normal           Near predicted monthly values 
                                 to 15% enhanced    
30 Dec   115    Normal-fair      Near predicted monthly values 
                                 to 15% enhanced   

COMMENT: ASWFC SWF HF Communications Warning 124 was issued on 
27 December and is current for 27-29 Dec. Maximum usable frequencies 
(MUFs) in the Australian region on UT day 27-Dec were near predicted 
values to 30% enhanced. Sporadic was observed at times at some 
sites. A shortwave fadeout was observed 27/0143-0226UT. MUFs 
are expected to be near predicted values to 15% enhanced over 
28-30 Dec. HF conditions for the southern Australian region may 
become degraded during local night hours on 30-Dec, with mild 
depressions possible on 31-Dec. Isolated shortwave fadeouts are 
possible.

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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