[Ips-dhfpr] ASWFC Daily HF Prop Report - 29 December 25 issued 2330 UT on 29 Dec 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/29 DECEMBER 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (29 DECEMBER) 
Date   T index  Conditions    
29 Dec   120    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M4.2 28/2239UT  possible   lower  East Pacific/
                                    North American
  M2.2    0002UT  possible   lower  West Pacific
  M1.0    0651UT  possible   lower  Mid East/Indian

MUFs:
   Cocos Island Region:
      No data available during local day.
      No data available during local night.
   Niue Island Region:
      Mostly near predicted monthly values.
      Enhanced by 20% after local dawn.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 15% during local night.
      Enhanced by 20% after local dawn.
   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 (30 DECEMBER - 01 JANUARY)
Date   T index  Conditions       MUFs                              
30 Dec   110    Normal-fair      Near predicted monthly values
31 Dec    90    Fair             Near predicted values    
01 Jan    90    Normal-fair      Near predicted monthly values 
                                 to 15% depressed   

COMMENT: ASWFC Preliminary HF Communications Warning 125 was 
issued on 29 December and is current for 31 Dec to 1 Jan. Maximum 
usable frequencies (MUFs) in the Australian region on UT day 
29-Dec were near predicted values to 20% enhanced. Sporadic-E 
was prominent along the east coast, particularly in Norfolk Island 
and in Brisbane. MUFs are expected to remain enhanced until 31-Dec, 
when they are likely to trend to baseline predicted values. Depressions 
up to 15% are possible on 1-Jan.

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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