[Ips-dhfpr] ASWFC Daily HF Prop Report - 18 January 26 issued 2334 UT on 18 Jan 2026 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/18 JANUARY 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (18 JANUARY) 
Date   T index  Conditions    
18 Jan    96    Fair-normal    

Flares    Max     Fadeout    Freq.  Sectors
  M1.1 17/2351UT  possible   lower  West Pacific
  X1.9    1809UT  probable   all    East Pacific/
                                    North American

MUFs:
   Cocos Island Region:
      Enhanced by 15% during local day.
      Near predicted monthly values during local night.
   Niue Island Region:
      Enhanced by 25% during local day.
      Near predicted monthly values during local night.
   Northern Australian Region:
      Enhanced by 20% during local day.
      Near predicted monthly values during local night.
      Depressed by 25% after local dawn.
   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
Dec      110
Jan      89
Feb      88


2. FORECAST (19 JANUARY - 21 JANUARY)
Date   T index  Conditions       MUFs                              
19 Jan    70    Fair-normal      Depressed 10 to 15%/near predicted 
                                 monthly values
20 Jan    45    Fair             Depressed 25 to 35%/near predicted 
                                 monthly values    
21 Jan    45    Fair             Depressed 25 to 35%/near predicted 
                                 monthly values   

COMMENT: ASWFC SWF HF Communications Warning 10 was issued on 
18 January and is current for 18-20 Jan. Maximum Usable Frequencies 
(MUFs) on UT day 17-Jan were mostly near predicted monthly values, 
with some enhancements observed in Northern Australia, the Cocos 
Islands, and Niue Island regions during local daytime hours. 
Some depressions up to 25% were observed in the Australian region 
after local dawn. Strong spread-F and sporadic-E were observed 
in the Southern Australian region. MUFs in the Australian region 
are expected to be depressed by 10-15% on 19-Jan due to coronal 
hole high-speed wind stream effects. Depressions of 25-35% are 
likely on 20-21 Jan due to a potential CME impact forecast for 
this day. Shortwave fadeouts are probable, and sporadic-E may 
be observed during local night hours.

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