[Ips-dhfpr] ASWFC Daily HF Prop Report - 19 May 25 issued 2331 UT on 19 May 2025 [SEC=OFFICIAL]

Australian Space Weather Forecasting Centre aswfc at bom.gov.au
Tue May 20 09:31:16 AEST 2025


SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/19 MAY 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (19 MAY) 
Date   T index  Conditions    
19 May    84    Normal-fair    

Flares    Max     Fadeout    Freq.  Sectors
  M3.2    0821UT  possible   lower  Mid East/Indian

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Depressed by 35% during local night.
   Niue Island Region:
      Enhanced by 15% during local day.
      Depressed by 40% during local night.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 25% 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
Apr      123
May      113
Jun      111


2. FORECAST (20 MAY - 22 MAY)
Date   T index  Conditions       MUFs                              
20 May    85    Normal-fair      Depressed 15%/near predicted 
                                 monthly values
21 May    85    Normal           Depressed 15%/near predicted 
                                 monthly values    
22 May    85    Normal           Depressed 15%/near predicted 
                                 monthly values   

COMMENT: ASWFC SWF HF Communications Warning 49 was issued on 
18 May and is current for 18-20 May. Maximum usable frequencies 
(MUFs) in the Australian region on UT day 19-May were near predicted 
monthly values to 25% depressed. Sporadic E and Spread F were 
observed at Hobart during local night hours. MUFs are expected 
to be near predicted monthly values to 15% depressed over 20-22 
May due to elevated geomagnetic activity. 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



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