[Ips-dhfpr] ASWFC Daily HF Prop Report - 08 December 25 issued 2339 UT on 08 Dec 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/08 DECEMBER 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (08 DECEMBER) 
Date   T index  Conditions    
08 Dec   132    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M2.4    0012UT  possible   lower  West Pacific
  M2.0    0036UT  possible   lower  West Pacific
  X1.1    0501UT  probable   all    E. Asia/Aust.
  M1.8    0654UT  possible   lower  Mid East/Indian
  M1.0    1306UT  possible   lower  European
  M3.1    2117UT  possible   lower  East Pacific/
                                    North American
  M1.2    2228UT  possible   lower  East Pacific/
                                    North American

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 15% during local day.
      Enhanced by 25% during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 20% during local night.
   Southern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 20% during local night.
      Enhanced by 25% after local dawn.
   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 (09 DECEMBER - 11 DECEMBER)
Date   T index  Conditions       MUFs                              
09 Dec    90    Fair-poor        Near predicted monthly values
10 Dec   100    Normal-fair      Near predicted monthly values    
11 Dec   100    Normal-fair      Near predicted monthly values   

COMMENT: ASWFC Preliminary HF Communications Warning 117 was 
issued on 6 December and is current for 9-10 Dec. ASWFC SWF HF 
Communications Warning 119 was issued on 8 December and is current 
for 8-9 Dec. Maximum usable frequencies (MUFs) in the Australian 
region on UT day 8-Dec were near predicted values to 25% enhanced. 
Sporadic-E was observed in several sites. MUFs are expected to 
be near monthly predicted values, as several CMEs suppress already 
enhanced MUFs. Depressions of 20% may begin by local night hours 
on 9-Dec and into 10-Dec. Nighttime sporadic-E is expected. Shortwave 
fadeouts are probable.

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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