[Ips-dhfpr] ASWFC Daily HF Prop Report - 12 May 25 issued 2331 UT on 12 May 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/12 MAY 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (12 MAY) 
Date   T index  Conditions    
12 May    87    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M1.9    0001UT  possible   lower  West Pacific

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

PCA Event : No event.

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


2. FORECAST (13 MAY - 15 MAY)
Date   T index  Conditions       MUFs                              
13 May    95    Normal           Near predicted monthly values
14 May   105    Normal           Near predicted monthly values    
15 May   105    Normal           Near predicted monthly values   

COMMENT: Maximum usable frequencies (MUFs) in the Australian 
region on UT day 11-May were depressed by 15-25% in the southern 
Australian region. MUFs were near predicted monthly values in 
the northern Australian region. Spread F was observed at Hobart, 
Canberra and Perth during local night hours. Sporadic E was observed 
at Brisbane during local night hours. MUFs are expected to be 
near predicted monthly values over 13-15 May.

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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