[Ips-dhfpr] ASWFC Daily HF Prop Report - 04 June 25 issued 2330 UT on 04 Jun 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/04 JUNE 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (04 JUNE) 
Date   T index  Conditions    
04 Jun    57    Fair-poor      

Flares: none.

MUFs:
   Cocos Island Region:
      Enhanced by 45% during local day.
      Enhanced by 20% during local night.
   Niue Island Region:
      Near predicted monthly values during local day.
      Depressed by 30% during local night.
      Depressed by 20% after local dawn.
   Northern Australian Region:
      Depressed by 25% during local day.
      Depressed by 30% during local night.
   Southern Australian Region:
      Depressed by 35% during local day.
      Depressed by 35% during local night.
      Depressed by 20% after local dawn.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 15% over the UT day.

PCA Event : No event.

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


2. FORECAST (05 JUNE - 07 JUNE)
Date   T index  Conditions       MUFs                              
05 Jun    80    Normal           Depressed 15%/near predicted 
                                 monthly values
06 Jun    90    Normal           Near predicted monthly values    
07 Jun    95    Normal           Near predicted monthly values   

COMMENT: ASWFC HF Communications Warning 57 was issued on 4 June 
and is current for 4-5 Jun. ASWFC SWF HF Communications Warning 
58 was issued on 4 June and is current for 4-6 Jun. Maximum usable 
frequencies (MUFs) in the Australian region on UT day 04-Jun 
were depressed by 20-35%. Spread F was observed at Hobart, Canberra 
and Brisbane during local night hours. MUFs are expected to be 
depressed by up to 15% at the start of 05-Jun recovering towards 
predicted monthly values over 05-07 Jun. Shortwave fadeouts are 
possible.

----------------------------------------------------------
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