[Ips-dhfpr] ASWFC Daily HF Prop Report - 07 December 25 issued 2330 UT on 07 Dec 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/07 DECEMBER 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (07 DECEMBER) 
Date   T index  Conditions    
07 Dec   146    Normal         

Flares: none.

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Enhanced by 15% during local night.
      Enhanced by 25% after local dawn.
   Niue Island Region:
      Enhanced by 40% during local day.
      Enhanced by 75% during local night.
      Enhanced by 30% after local dawn.
   Northern Australian Region:
      Enhanced by 15% 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 (08 DECEMBER - 10 DECEMBER)
Date   T index  Conditions       MUFs                              
08 Dec   130    Normal           Near predicted monthly values 
                                 to 20% enhanced
09 Dec    90    Fair             Near predicted monthly values 
                                 to 20% depressed    
10 Dec   100    Normal-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. ASWFC SWF HF 
Communications Warning 118 was issued on 7 December and is current 
for 7-8 Dec. Maximum usable frequencies (MUFs) in the Australian 
region on UT day 7-Dec were near predicted values to 30% enhanced. 
Sporadic-E was observed in Niue, Norfolk Island and Hobart during 
local night hours. MUFs are expected to be enhanced by 20% on 
UT day 8-Dec, but likely to trend down to near predicted values 
on 9-Dec. Depressions of 20% may begin by local night hours on 
9-Dec and into 10-Dec. Nighttime sporadic-E is expected.

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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