[Ips-dhfpr] ASWFC Daily HF Prop Report - 17 January 26 issued 2330 UT on 17 Jan 2026 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/17 JANUARY 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (17 JANUARY) 
Date   T index  Conditions    
17 Jan    87    Normal-fair    

Flares    Max     Fadeout    Freq.  Sectors
  M2.1    1029UT  possible   lower  European

MUFs:
   Cocos Island Region:
      Near predicted monthly values.
   Niue Island Region:
      Near predicted monthly values during local day.
      Enhanced by 20% during local night.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian Region:
      Mostly near predicted monthly values.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 20% over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Dec      110
Jan      89
Feb      88


2. FORECAST (18 JANUARY - 20 JANUARY)
Date   T index  Conditions       MUFs                              
18 Jan    75    Fair-normal      Depressed 10 to 15%/near predicted 
                                 monthly values
19 Jan    70    Normal-fair      Depressed 10 to 15%/near predicted 
                                 monthly values    
20 Jan    87    Normal-fair      Near predicted monthly values   

COMMENT: Maximum Usable Frequencies (MUFs) on UT day 17-Jan were 
mostly near predicted monthly values, with some enhancements 
seen in Niue Island. Strong spread-F and sporadic-E were observed 
in the Southern Australian region. MUFs were depressed in the 
Antarctic region by up to 20%. MUFs in the Australian region 
are expected to be depressed by 10-15% on 18-19 Jan due to coronal 
hole high-speed wind streams effects. These will likely trend 
towards predicted values on 20-Jan as the wind stream effects 
subside. Shortwave fadeouts are possible, and sporadic-E may 
be observed during local night hours.

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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