[Ips-dhfpr] ASWFC Daily HF Prop Report - 18 October 26 issued 2330 UT on 18 Oct 2026 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

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

1. SUMMARY (18 OCTOBER) 
Date   T index  Conditions    
18 Oct    45    Normal-fair    

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.
      Near predicted monthly values during local night.
   Northern Australian Region:
      Mostly near predicted monthly values.
   Southern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 15% during local night.
   Antarctic Region (Casey/Davis/Mawson):
      Near predicted monthly values over the UT day.

PCA Event : No event.

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


2. FORECAST (19 OCTOBER - 21 OCTOBER)
Date   T index  Conditions       MUFs                              
19 Oct    50    Normal           Near predicted monthly values
20 Oct    45    Normal           Near predicted monthly values    
21 Oct    50    Normal           Near predicted monthly values   

COMMENT: ASWFC SWF HF Communications Warning 89 was issued on 
17 October and is current for 18-19 Oct. Maximum Usable Frequencies 
(MUFs) in the Australian region were mostly near predicted values 
on 18-Oct, with some depressions observed in the southern Australian 
region at the beginning of the UT day. Sporadic E was observed 
in the northern Australian region during local night hours, with 
spread F observed at Hobart and Canberra during local night hours. 
MUFs are forecast to be near predicted values over 19-21 Oct, 
with some mild depressions possible on 20-Oct due to forecast 
geomagnetic activity. 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