[Ips-dhfpr] ASWFC Daily HF Prop Report - 26 June 25 issued 2330 UT on 26 Jun 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/26 JUNE 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (26 JUNE) 
Date   T index  Conditions    
26 Jun    86    Normal-fair    

Flares: none.

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Depressed by 15% during local night.
      Depressed by 25% after local dawn.
   Niue Island Region:
      Depressed by 15% during local day.
      Depressed by 35% during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 20% during local night.
   Southern Australian Region:
      Mostly near predicted monthly values.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 25% over the UT day.

PCA Event : No event.

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


2. FORECAST (27 JUNE - 29 JUNE)
Date   T index  Conditions       MUFs                              
27 Jun    75    Normal-fair      20 to 30% below predicted monthly 
                                 values
28 Jun    65    Normal-fair      20 to 30% below predicted monthly 
                                 values    
29 Jun    65    Normal           20 to 30% below predicted monthly 
                                 values   

COMMENT: Maximum usable frequencies (MUFs) in the Australian 
region on UT day 26-Jun were near predicted values to 20% depressed. 
Spread-F was observed in Brisbane, Hobart and Perth during local 
night hours. Conditions in Darwin were degraded. MUFs are expected 
to be near predicted values to 20-30% depressed over 27-29 Jun 
due to ongoing coronal hole activity.

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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