[Ips-dhfpr] ASWFC Daily HF Prop Report - 06 December 25 issued 2330 UT on 06 Dec 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/06 DECEMBER 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (06 DECEMBER) 
Date   T index  Conditions    
06 Dec   135    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M1.1    1921UT  possible   lower  East Pacific/
                                    North American
  M8.1    2039UT  probable   lower  East Pacific/
                                    North American

MUFs:
   Cocos Island Region:
      Mostly near predicted monthly values.
      Enhanced by 20% after local dawn.
   Niue Island Region:
      Enhanced by 20% during local day.
      Enhanced by 25% during local night.
   Northern Australian Region:
      Enhanced by 20% during local day.
      Enhanced by 20% during local night.
   Southern Australian Region:
      Near predicted monthly values.
   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 (07 DECEMBER - 09 DECEMBER)
Date   T index  Conditions       MUFs                              
07 Dec   120    Normal           Near predicted monthly values 
                                 to 20% enhanced
08 Dec   120    Normal           Near predicted monthly values 
                                 to 20% enhanced    
09 Dec    80    Fair             Near predicted monthly values 
                                 to 20% depressed   

COMMENT: ASWFC Preliminary HF Communications Warning 117 was 
issued on 6 December and is current for 9-10 Dec. Maximum usable 
frequencies (MUFs) in the Australian region on UT day 6-Dec were 
near predicted values to 20% enhanced. Sporadic-E was common 
during local night hours at low latitude sights and along the 
east coast of Australia. MUFs are expected to be near predicted 
values to 20% enhanced over 7-8 Dec. MUFs are expected to be 
near predicted values to 20% depressed on 9-Dec. Sporadic-E is 
expected to persist.

----------------------------------------------------------
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