[Ips-dhfpr] ASWFC Daily HF Prop Report - 25 May 25 issued 2331 UT on 25 May 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/25 MAY 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (25 MAY) 
Date   T index  Conditions    
25 May    79    Normal-fair    

Flares    Max     Fadeout    Freq.  Sectors
  X1.1    0152UT  probable   all    West Pacific
  M1.7    0635UT  possible   lower  Mid East/Indian
  M3.4    1018UT  possible   lower  European
  M8.9    1630UT  probable   lower  South American/
                                    Atlantic

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

PCA Event : No event.

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


2. FORECAST (26 MAY - 28 MAY)
Date   T index  Conditions       MUFs                              
26 May    75    Normal           15 to 20% below predicted monthly 
                                 values
27 May    75    Normal           15 to 20% below predicted monthly 
                                 values    
28 May    75    Normal           15 to 20% below predicted monthly 
                                 values   

COMMENT: ASWFC SWF HF Communications Warning 52 was issued on 
25 May and is current for 25-27 May. Maximum usable frequencies 
(MUFs) in the Australian region on UT day 25-May were near predicted 
monthly values to 15-35% depressed. Spread F was observed at 
Hobart and Brisbane during local night hours. MUFs are expected 
to be 15-20% depressed over 26-28 May. Shortwave fadeouts are 
probable.

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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