[Ips-dhfpr] ASWFC Daily HF Prop Report - 18 June 25 issued 2330 UT on 18 Jun 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/18 JUNE 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (18 JUNE) 
Date   T index  Conditions    
18 Jun    93    Fair-normal    

Flares    Max     Fadeout    Freq.  Sectors
  M1.5    0000UT  possible   lower  West Pacific

MUFs:
   Cocos Island Region:
      Enhanced by 15% during local day.
      Depressed by 35% during local night.
   Niue Island Region:
      Near predicted monthly values during local day.
      Depressed by 30% during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 20% during local night.
   Southern Australian Region:
      Near predicted monthly values.
   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 (19 JUNE - 21 JUNE)
Date   T index  Conditions       MUFs                              
19 Jun    90    Fair-normal      Depressed 10 to 15%/near predicted 
                                 monthly values
20 Jun    90    Fair-normal      Depressed 10 to 15%/near predicted 
                                 monthly values    
21 Jun   105    Normal           Near predicted monthly values   

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 on 18-Jun were near predicted 
monthly values during the local day. Northern Australian region 
MUFs were 20% depressed during local night hours. Spread F was 
observed during local night hours in the southern Australian 
region. MUFs are expected to be mildly depressed by 15% to near 
predicted values for 19-20 Jun and near predicted monthly values 
on 21-Jun, with mildly degraded HF conditions during local night 
hours. Isolated fadeouts are possible.

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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