[Ips-dhfpr] ASWFC Daily HF Prop Report - 22 July 25 issued 2352 UT on 22 Jul 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/22 JULY 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (22 JULY) 
Date   T index  Conditions    
22 Jul    81    Fair-normal    

Flares: none.

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Depressed by 35% during local night.
   Niue Island Region:
      Depressed by 15% during local day.
      Depressed by 25% during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 25% 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 (23 JULY - 25 JULY)
Date   T index  Conditions       MUFs                              
23 Jul    75    Normal-fair      Depressed 15 to 20%/near predicted 
                                 monthly values
24 Jul    75    Normal-fair      Depressed 15 to 20%/near predicted 
                                 monthly values    
25 Jul    75    Normal           Depressed 15 to 20%/near predicted 
                                 monthly values   

COMMENT: Maximum usable frequencies (MUFs) in the Australian 
region on UT day 22-Jul were 20% depressed to near predicted 
monthly values. Spread F was observed during local night hours 
at Hobart, Townsville, Norfolk and Perth. MUFs are expected to 
be generally 15-20% depressed to near predicted monthly values 
over 23-25 Jul.

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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