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

[Australian Space Weather Forecasting Centre]

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

1. SUMMARY (17 JULY) 
Date   T index  Conditions    
17 Jul    59    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 20% during local day.
      Depressed by 20% during local night.
      Depressed by 20% after local dawn.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 20% during local night.
   Southern Australian Region:
      Near predicted monthly values.
   Antarctic Region (Casey/Davis/Mawson):
      Near predicted monthly values over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Jun      81
Jul      66
Aug      63


2. FORECAST (18 JULY - 20 JULY)
Date   T index  Conditions       MUFs                              
18 Jul    55    Normal           Near predicted monthly values
19 Jul    55    Normal           Near predicted monthly values    
20 Jul    55    Normal           Near predicted monthly values   

COMMENT: Maximum Usable Frequencies (MUFs) in the Australian 
region on UT day 17-Jul were mostly near predicted monthly values, 
with depressions up to 20% observed during local night hours 
in the northern Australian region. Strong spread-F was observed 
across the Australian region during local night hours. MUFs are 
forecast to be near predicted monthly values over 18-20 Jul, 
with some depressions possible during local night hours.

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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