[Ips-dhfpr] ASWFC Daily HF Prop Report - 21 October 26 issued 2336 UT on 21 Oct 2026 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/21 OCTOBER 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (21 OCTOBER) 
Date   T index  Conditions    
21 Oct    46    Normal         

Flares: none.

MUFs:
   Cocos Island Region:
      No data available during local day.
      No data available during local night.
   Niue Island Region:
      Enhanced by 15% during local day.
      Depressed by 15% during local night.
   Northern Australian Region:
      Mostly near predicted monthly values.
      Depressed by 20% after local dawn.
   Southern Australian Region:
      Near predicted monthly values.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 15% over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Sep      61
Oct      60
Nov      58


2. FORECAST (22 OCTOBER - 24 OCTOBER)
Date   T index  Conditions       MUFs                              
22 Oct    50    Normal           Near predicted monthly values
23 Oct    50    Normal           Near predicted monthly values    
24 Oct    50    Normal           Near predicted monthly values   

COMMENT: Maximum Usable Frequencies (MUFs) on UT day 21-Oct in 
the Australian region were mostly near predicted values, with 
some depressions in the northern Australian region after local 
dawn. Mild depressions were also observed at Canberra and Hobart. 
MUFs are forecast to be near predicted monthly values over 22-24 
Oct.

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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