[Ips-dhfpr] ASWFC Daily HF Prop Report - 10 May 25 issued 2330 UT on 10 May 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/10 MAY 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (10 MAY) 
Date   T index  Conditions    
10 May    95    Fair           

Flares: none.

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Depressed by 30% during local night.
   Niue Island Region:
      Near predicted monthly values during local day.
      Depressed by 25% during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 20% during local night.
   Southern Australian Region:
      Depressed by 20% during after local dawn and during local day.
      Depressed by 25% during local night.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 30% over the UT day.

PCA Event : No event.

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


2. FORECAST (11 MAY - 13 MAY)
Date   T index  Conditions       MUFs                              
11 May    90    Normal           Depressed 15%/near predicted 
                                 monthly values
12 May    95    Normal           Near predicted monthly values    
13 May    95    Normal           Near predicted monthly values   

COMMENT: Maximum usable frequencies (MUFs) in the Australian 
region on UT day 10-May were depressed by 20-25% in southern 
Australian regions. MUFs were near predicted monthly values to 
20% depressed during local night in northern Australia. Spread 
F was observed at Hobart and Canberra during local night hours. 
MUFs are expected to be near predicted monthly values to 15% 
depressed on 11-May, improving to near predicted monthly values 
over 12-13 May. Minor 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