[Ips-dhfpr] ASWFC Daily HF Prop Report - 19 June 25 issued 2330 UT on 19 Jun 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/19 JUNE 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (19 JUNE) 
Date   T index  Conditions    
19 Jun    87    Fair-normal    

Flares: none.

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Enhanced by 25% during local night.
      Depressed by 20% after local dawn.
   Niue Island Region:
      Near predicted monthly values during local day.
      Depressed by 25% during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 30% during local night.
   Southern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 10-20% during local night.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 30% over the UT day.
      Frequent spread F and sporadic E.

PCA Event : No event.

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


2. FORECAST (20 JUNE - 22 JUNE)
Date   T index  Conditions       MUFs                              
20 Jun    90    Fair-normal      Depressed 10 to 15%/near predicted 
                                 monthly values
21 Jun   100    Normal           Near predicted monthly values    
22 Jun   100    Normal           Near predicted monthly values   

COMMENT: Maximum usable frequencies (MUFs) in the Australian 
region on 19-Jun were near predicted monthly values during the 
local day and depressed 10-30% during local night hours. Spread 
F was observed at Canberra and Hobart during local night hours. 
Degraded HF conditions were observed at times in the Antarctic 
region. MUFs are expected to be mildly depressed by 15% to near 
predicted values for 20-Jun and near predicted monthly values 
on 21-22 Jun.

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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