[Ips-dhfpr] ASWFC Daily HF Prop Report - 20 January 26 issued 2330 UT on 20 Jan 2026 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/20 JANUARY 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (20 JANUARY) 
Date   T index  Conditions    
20 Jan   -16    Poor           

Flares: none.

MUFs:
   Cocos Island Region:
      Depressed by 40% during local day.
      Depressed by 55% during local night.
      Depressed by 50% after local dawn.
   Niue Island Region:
      Near predicted monthly values.
   Northern Australian Region:
      Depressed by 60% during local day.
      Depressed by 55% during local night.
   Southern Australian Region:
      Depressed by 40% during local day.
      Depressed by 55% during local night.
      Depressed by 30% after local dawn.
   Antarctic Region (Casey/Davis/Mawson):
      Near predicted monthly values over the UT day.
      Proton event in progress, increased absorption observed.

PCA Event : 10MeV Proton/PCA Event Began 18 01 2026 2240UT and is in progress

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


2. FORECAST (21 JANUARY - 23 JANUARY)
Date   T index  Conditions       MUFs                              
21 Jan    20    Fair-poor        25 to 50% below predicted monthly 
                                 values
22 Jan    50    Normal-fair      15 to 20% below predicted monthly 
                                 values    
23 Jan    70    Normal           Near predicted monthly values   

COMMENT: ASWFC SWF HF Communications Warning 12 was issued on 
19 January and is current for 19-21 Jan. ASWFC HF Communications 
Warning 13 was issued on 20 January and is current for 20-21 
Jan. Maximum Usable Frequencies (MUFs) in the Australian region 
were depressed by 30-60% on UT day 20-Jan, with the strongest 
depressions observed in northern Australia. Strong spread-F was 
observed in the Southern Australian region. MUFs in the Australian 
region are expected to be depressed by 25-50% on 21-Jan due to 
ongoing geomagnetic activity. MUFs are expected to be 15-20% 
depressed on 22-Jan, before recovering to near predicted monthly 
values on 23-Jan. Shortwave fadeouts are possible.

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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