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

[Australian Space Weather Forecasting Centre]

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

1. SUMMARY (17 OCTOBER) 
Date   T index  Conditions    
17 Oct    53    Normal         

Flares: none.

MUFs:
   Cocos Island Region:
      No data available during local day.
      No data available during local night.
   Niue Island Region:
      Enhanced by 20% during local day.
      Depressed by 15% during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 15% during local night.
   Southern Australian Region:
      Depressed by 15% 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 (18 OCTOBER - 20 OCTOBER)
Date   T index  Conditions       MUFs                              
18 Oct    60    Normal           Near predicted monthly values
19 Oct    60    Normal           Near predicted monthly values    
20 Oct    55    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) were near predicted values in the northern Australian 
region on UT day 17-Oct, with some enhancements of up to 15% 
also observed. MUFs in the southern Australian region were depressed 
by up to 15%, with persistent depressions observed at Canberra. 
Strong spread F was observed at Canberra, with sporadic E also 
observed at various sites in the Australian region during local 
night hours. MUFs are forecast to be near predicted values over 
18-20 Oct, with some mild depressions possible in the southern 
Australian region on 20-Oct due to forecast geomagnetic activity. 
Shortwave fadeouts are possible.

----------------------------------------------------------
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