[Ips-dhfpr] ASWFC Daily HF Prop Report - 28 December 25 issued 2330 UT on 28 Dec 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/28 DECEMBER 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (28 DECEMBER) 
Date   T index  Conditions    
28 Dec   124    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M1.3    2113UT  possible   lower  East Pacific/
                                    North American
  M4.2    2239UT  possible   lower  East Pacific/
                                    North American

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 20% during local night.
   Southern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 15% 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 (29 DECEMBER - 31 DECEMBER)
Date   T index  Conditions       MUFs                              
29 Dec   115    Normal           Near predicted monthly values 
                                 to 15% enhanced
30 Dec   115    Fair-normal      Near predicted monthly values 
                                 to 15% enhanced    
31 Dec    60    Fair-normal      Depressed 15 to 20%/near predicted 
                                 monthly values   

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 28-Dec were near predicted 
monthly values to 20% enhanced. MUFs are expected to be near 
predicted monthly values to 15% enhanced over 29-30 Dec. HF conditions 
for the southern Australian region may become degraded during 
local night hours on 30-Dec, with 15-20% 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