[Ips-dhfpr] ASWFC Daily HF Prop Report - 28 June 25 issued 2330 UT on 28 Jun 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/28 JUNE 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (28 JUNE) 
Date   T index  Conditions    
28 Jun    66    Fair-normal    

Flares: none.

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

PCA Event : No event.

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


2. FORECAST (29 JUNE - 01 JULY)
Date   T index  Conditions       MUFs                              
29 Jun    85    Normal           Depressed 15 to 20%/near predicted 
                                 monthly values
30 Jun    85    Normal           Depressed 15 to 20%/near predicted 
                                 monthly values    
01 Jul    85    Normal           Depressed 15 to 20%/near predicted 
                                 monthly values   

COMMENT: Maximum usable frequencies (MUFs) in the Australian 
region on UT day 28-Jun were 20% depressed to near predicted 
values. Spread-F was observed at Darwin, Hobart and Norfolk Island 
during local night hours. MUFs are expected to be 15-20% depressed 
to near predicted values over 29-Jun to 01-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