[Ips-dhfpr] ASWFC Daily HF Prop Report - 12 June 25 issued 2330 UT on 12 Jun 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/12 JUNE 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (12 JUNE) 
Date   T index  Conditions    
12 Jun   108    Normal-fair    

Flares: none.

MUFs:
   Cocos Island Region:
      Enhanced by 20% during local day.
      Depressed by 35% during local night.
      Depressed by 30% after local dawn.
   Niue Island Region:
      Mostly near predicted monthly values.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 15% during local night.
   Southern Australian Region:
      Mostly near predicted monthly values.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 30% over the UT day.

PCA Event : No event.

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


2. FORECAST (13 JUNE - 15 JUNE)
Date   T index  Conditions       MUFs                              
13 Jun    90    Normal-fair      Depressed 10 to 15%/near predicted 
                                 monthly values
14 Jun    90    Normal-fair      Depressed 10 to 15%/near predicted 
                                 monthly values    
15 Jun    80    Normal-fair      Depressed 10 to 20%/near predicted 
                                 monthly values   

COMMENT: Maximum usable frequencies (MUFs) in the Australian 
region on UT day 12-Jun were near predicted values to 15% depressed. 
Most sites in the Australian region were degraded during local 
midnight to dawn hours. Spread-F was observed in Hobart and Brisbane; 
sporadic-E was observed in Darwin and Canberra. MUFs are expected 
to be near predicted values to 15% depressed over 13-14 Jun, 
then further depressions are likely as Earth is expected to connect 
to a coronal hole by this time.

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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