[Ips-dhfpr] ASWFC Daily HF Prop Report - 11 October 26 issued 2330 UT on 11 Oct 2026 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/11 OCTOBER 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (11 OCTOBER) 
Date   T index  Conditions    
11 Oct    -3    Fair-poor      

Flares: none.

MUFs:
   Cocos Island Region:
      No data available during local day.
      No data available during local night.
   Niue Island Region:
      Near predicted monthly values during local day.
      Depressed by 20% during local night.
   Northern Australian Region:
      Depressed by 45% during local day.
      Depressed by 30% during local night.
   Southern Australian Region:
      Depressed by 40% during local day.
      Depressed by 30% during local night.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 30% over the UT day.

PCA Event : No event.

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


2. FORECAST (12 OCTOBER - 14 OCTOBER)
Date   T index  Conditions       MUFs                              
12 Oct    20    Normal-fair      15 to 20% below predicted monthly 
                                 values
13 Oct    35    Normal-fair      Depressed 15%/near predicted 
                                 monthly values    
14 Oct    50    Normal-fair      Near predicted monthly values   

COMMENT: ASWFC SWF HF Communications Warning 86 was issued on 
10 October and is current for 10-12 Oct. Maximum Usable Frequencies 
(MUFs) in the Australian region were 20-45% depressed on UT day 
11-Oct. The strongest depressions were observed in northern Australian 
regions. Strong spread F was observed at several Australian sites 
during local night hours. MUFs are expected to remain depressed 
by 15-20% on 12-Oct, and 15% depressed on 13-Oct due to forecast 
geomagnetic activity. MUFs are forecast to return to near predicted 
monthly values on 14-Oct. 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