[Ips-dhfpr] ASWFC Daily HF Prop Report - 24 June 25 issued 2330 UT on 24 Jun 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/24 JUNE 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (24 JUNE) 
Date   T index  Conditions    
24 Jun    74    Normal-fair    

Flares: none.

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Depressed by 25% during local night.
      Depressed by 25% after local dawn.
   Niue Island Region:
      Depressed by 15% during local day.
      Depressed by 30% during local night.
   Northern Australian Region:
      Depressed by 15% during local day.
      Depressed by 30% during local night.
      Depressed by 20% after local dawn.
   Southern Australian Region:
      Depressed by 20% during local day.
      Near predicted monthly values during local night.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 15% over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
May      94
Jun      109
Jul      107


2. FORECAST (25 JUNE - 27 JUNE)
Date   T index  Conditions       MUFs                              
25 Jun    80    Normal-fair      Depressed 10 to 15%/near predicted 
                                 monthly values
26 Jun    65    Fair-normal      Depressed 15 to 20%/near predicted 
                                 monthly values    
27 Jun    80    Normal-fair      Depressed 10 to 15%/near predicted 
                                 monthly values   

COMMENT: Maximum usable frequencies (MUFs) in the Australian 
region on UT day 24-Jun were generally 15 to 30% depressed. Spread 
F was observed at Canberra, Hobart and Brisbane during local 
hight hours. Degraded HF conditions were observed in the Antarctic 
region. MUFs are expected to be 10-20% depressed to near predicted 
monthly values 25-26 Jun, with degraded HF conditions for the 
southern Australian region over 25-26 Jun during local night 
hours due to expected geomagnetic activity from a coronal hole 
wind stream.

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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