[Ips-dhfpr] ASWFC Daily HF Prop Report - 18 July 25 issued 2332 UT on 18 Jul 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/18 JULY 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (18 JULY) 
Date   T index  Conditions    
18 Jul    98    Normal         

Flares: none.

MUFs:
   Cocos Island Region:
      Mostly near predicted monthly values.
      Depressed by 20% after local dawn.
   Niue Island Region:
      Enhanced by 30% during local day.
      Enhanced by 30% during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 15% 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      79
Jul      104
Aug      102


2. FORECAST (19 JULY - 21 JULY)
Date   T index  Conditions       MUFs                              
19 Jul    82    Normal           Depressed 10 to 15%/near predicted 
                                 monthly values
20 Jul    85    Normal           Depressed 10 to 15%/ near predicted 
                                 monthly values    
21 Jul    90    Normal           Near predicted monthly values   

COMMENT: Maximum usable frequencies (MUFs) in the Australian 
region were near predicted values to 15% depressed. Conditions 
were degraded across all Australian sites during local dusk and 
nighttime hours, with significant sporadic-E at many stations. 
Scintillation was observed at Niue from 0834 to 0850 UT. MUFs 
are expected to be near predicted values to 15% depressed over 
19-20 Jul before returning to near normal. Degraded conditions 
are likely to ease.

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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