[Ips-dhfpr] ASWFC Daily HF Prop Report - 07 May 25 issued 2331 UT on 07 May 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/07 MAY 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (07 MAY) 
Date   T index  Conditions    
07 May    96    Fair-normal    

Flares: none.

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Depressed by 20% during local night.
   Niue Island Region:
      Near predicted monthly values during local day.
      Depressed by 30% during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 25% during local night.
   Southern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 30% 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 (08 MAY - 10 MAY)
Date   T index  Conditions       MUFs                              
08 May    92    Normal           Depressed 15%/near predicted 
                                 monthly values
09 May    92    Normal-fair      Depressed 15%/near predicted 
                                 monthly values    
10 May    92    Normal           Depressed 15%/near predicted 
                                 monthly values   

COMMENT: ASWFC HF Communications Warning 45 was issued on 7 May 
and is current for 8-10 May. Maximum usable frequencies (MUFs) 
in the Australian region on UT day 07-May were near predicted 
monthly values to 25-30% depressed during local night. Spread 
F was observed at Hobart during local night hours. Sporadic E 
was observed at Perth and Learmonth for significant periods of 
07-May. MUFs are expected to be mostly near predicted monthly 
values over 08-10 May, with a chance of depressions of up to 
15% due to anticipated geomagnetic activity. 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