[Ips-dhfpr] ASWFC Daily HF Prop Report - 16 December 25 issued 2330 UT on 16 Dec 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/16 DECEMBER 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (16 DECEMBER) 
Date   T index  Conditions    
16 Dec    81    Normal-fair    

Flares: none.

MUFs:
   Cocos Island Region:
      Near predicted monthly values.
   Niue Island Region:
      Near predicted monthly values.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian Region:
      Near predicted monthly values.
   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 (17 DECEMBER - 19 DECEMBER)
Date   T index  Conditions       MUFs                              
17 Dec    95    Normal           Near predicted monthly values
18 Dec    90    Normal-fair      Near predicted monthly values 
                                 to 10-15% depressed    
19 Dec    90    Normal           Near predicted monthly values 
                                 to 10-15% depressed   

COMMENT: Maximum usable frequencies (MUFs) in the Australian 
region were near predicted values on UT day 16-Dec. Sporadic-E 
was observed in Brisbane and spread-F was observed in Hobart. 
MUFs are expected to be near predicted values on 17-Dec. MUFs 
may experience mild 10-15% depressions over 18-19 Dec.
Strong sporadic-E is expected to continue in Brisbane,
causing degraded signal propagation.

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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