[Ips-dhfpr] ASWFC Daily HF Prop Report - 10 December 25 issued 2332 UT on 10 Dec 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/10 DECEMBER 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (10 DECEMBER) 
Date   T index  Conditions    
10 Dec   148    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M1.5 09/2327UT  possible   lower  West Pacific
  M1.2    0422UT  possible   lower  E. Asia/Aust.
  M1.9    0737UT  possible   lower  Mid East/Indian
  M1.0    0955UT  possible   lower  Mid East/Indian
  M1.6    1343UT  possible   lower  European
  M4.4    2208UT  possible   lower  East Pacific/
                                    North American

MUFs:
   Cocos Island Region:
      Near predicted monthly values.
   Niue Island Region:
      Enhanced by 15% during local day.
      Enhanced by 35% during local night.
   Northern Australian Region:
      Enhanced by 25% during local day.
      Enhanced by 25% during local night.
   Southern Australian Region:
      Enhanced by 15% during local day.
      Enhanced by 15% during local night.
      Enhanced by 20% 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 (11 DECEMBER - 13 DECEMBER)
Date   T index  Conditions       MUFs                              
11 Dec   120    Fair-normal      Near predicted monthly values
12 Dec   110    Fair-normal      Near predicted monthly values    
13 Dec   110    Normal-fair      Near predicted monthly values   

COMMENT: ASWFC SWF HF Communications Warning 120 was issued on 
9 December and is current for 9-11 Dec. Maximum usable frequencies 
(MUFs) were mostly enhanced by 15-25% during UT day 10-Dec, with 
up to 35% enhancements seen in Niue Island, and near predicted 
monthly values seen in the Antarctic region. Low frequency sporadic-E 
was observed in the southern Australian region. MUFs are forecast 
to be near predicted monthly values throughout 11-12 Dec, reduced 
from the current enhanced state due to the ongoing geomagnetic 
activity. This will likely continue into 13-Dec as high speed 
wind stream effects will commence. Sporadic-E during local night 
hours may also be observed. 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