[Ips-dhfpr] ASWFC Daily HF Prop Report - 17 June 25 issued 2330 UT on 17 Jun 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/17 JUNE 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (17 JUNE) 
Date   T index  Conditions    
17 Jun    85    Normal-fair    

Flares    Max     Fadeout    Freq.  Sectors
  X1.2    2149UT  probable   all    East Pacific/
                                    North American

MUFs:
   Cocos Island Region:
      Enhanced by 20% during local day.
      Depressed by 20% during local night.
   Niue Island Region:
      Near predicted monthly values during local day.
      Depressed by 40% during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 30% during local night.
      Depressed by 25% after local dawn.
   Southern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 15% during local night.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 20% over the UT day.

PCA Event : No event.

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


2. FORECAST (18 JUNE - 20 JUNE)
Date   T index  Conditions       MUFs                              
18 Jun    85    Normal-fair      Near predicted monthly values 
                                 to 10-20% depressed
19 Jun    85    Normal-fair      Near predicted monthly values 
                                 to 10-20% depressed    
20 Jun    85    Normal-fair      Near predicted monthly values 
                                 to 10-20% depressed   

COMMENT: ASWFC SWF HF Communications Warning 66 was issued on 
16 June and is current for 17-19 Jun. Maximum usable frequencies 
(MUFs) in the Australian region were depressed up to 30% during 
local night hours. Conditions were normal during daytime hours, 
however were heavily degraded during nighttime at most sites. 
MUFs are expected to be near predicted values during local daytime 
hours, but may experience similar depressions up to 20% during 
nighttime over 18-20 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