[Ips-dhfpr] ASWFC Daily HF Prop Report - 30 May 25 issued 2335 UT on 30 May 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/30 MAY 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (30 MAY) 
Date   T index  Conditions    
30 May    86    Fair-poor      

Flares    Max     Fadeout    Freq.  Sectors
  M3.4    0613UT  possible   lower  Mid East/Indian
  M1.6    1839UT  possible   lower  East Pacific/
                                    North American

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Depressed by 25% during local night.
   Niue Island Region:
      No data available during local day.
      No data available during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 30% during local night.
   Southern Australian Region:
      Depressed by 15% during local day.
      Depressed by 15% during local night.
      Depressed by 25% after local dawn.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 20% over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Apr      123
May      113
Jun      111


2. FORECAST (31 MAY - 02 JUNE)
Date   T index  Conditions       MUFs                              
31 May    80    Normal-fair      5 to 15% below predicted monthly 
                                 values
01 Jun    95    Normal           Near predicted monthly values    
02 Jun    95    Normal           Near predicted monthly values   

COMMENT: Maximum usable frequencies (MUFs) in the southern Australian 
region on UT day 30-May were depressed by up to 25%. MUFs in 
the northern Australian region were near predicted monthly values 
to depressed by up to 30%. Spread F was observed at Hobart and 
Canberra during local night hours. Sporadic E was observed at 
Cocos Islands during much of the UT day. MUFs are expected to 
be near predicted monthly values over 31-May to 02-Jun, with 
depressions of up to 15% possible on 31-May. Shortwave 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