[Ips-dhfpr] ASWFC Daily HF Prop Report - 13 May 25 issued 2330 UT on 13 May 2025 [SEC=OFFICIAL]

Australian Space Weather Forecasting Centre aswfc at bom.gov.au
Wed May 14 09:30:44 AEST 2025


SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/13 MAY 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (13 MAY) 
Date   T index  Conditions    
13 May    82    Normal-fair    

Flares    Max     Fadeout    Freq.  Sectors
  X1.2    1538UT  probable   all    South American/
                                    Atlantic

MUFs:
   Cocos Island Region:
      Enhanced by 15% during local day.
      Depressed by 20% during local night.
   Niue Island Region:
      Near predicted monthly values during local day.
      Depressed by 35% 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 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 (14 MAY - 16 MAY)
Date   T index  Conditions       MUFs                              
14 May    85    Normal           Depressed 15%/near predicted 
                                 monthly values
15 May   100    Normal           Near predicted monthly values    
16 May   100    Normal           Near predicted monthly values   

COMMENT: Maximum usable frequencies (MUFs) in the Australian 
region on UT day 13-May were depressed by 15-20% during local 
night and were near predicted monthly values during local day. 
Spread F was observed at Hobart. MUFs are expected to be near 
predicted monthly values to 15% depressed on 14-May. MUFs are 
expected to recover to near monthly predicted values over 15-16 
May. Mild 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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