[Ips-dhfpr] ASWFC Daily HF Prop Report - 30 December 25 issued 2331 UT on 30 Dec 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/30 DECEMBER 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (30 DECEMBER) 
Date   T index  Conditions    
30 Dec   137    Normal         

Flares: none.

MUFs:
   Niue Island Region:
      Enhanced by 30% during local day.
      Enhanced by 35% during local night.
   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 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 (31 DECEMBER - 02 JANUARY)
Date   T index  Conditions       MUFs                              
31 Dec   120    Fair             Near to 15% above predicted 
                                 monthly values
01 Jan    90    Normal-fair      Near predicted monthly values    
02 Jan    90    Normal           Near predicted monthly values   

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 
30-Dec were near predicted monthly values to 30% enhanced. MUFs 
are expected to remain enhanced on 31-Dec, then decline to near 
predicted monthly values over 01-02 Jan due to forecast geomagnetic 
activity. 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