[Ips-dhfpr] ASWFC Daily HF Prop Report - 23 May 25 issued 2330 UT on 23 May 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/23 MAY 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (23 MAY) 
Date   T index  Conditions    
23 May    83    Normal-fair    

Flares: none.

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Depressed by 15% during local night.
   Niue Island Region:
      Near predicted monthly values during local day.
   Northern Australian Region:
      Depressed by 15% during local day.
      Depressed by 30% during local night.
   Southern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 20% 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 (24 MAY - 26 MAY)
Date   T index  Conditions       MUFs                              
24 May    85    Normal           Depressed 15%/near predicted 
                                 monthly values
25 May    85    Normal           Depressed 15%/near predicted 
                                 monthly values    
26 May    85    Normal           Depressed 15%/near predicted 
                                 monthly values   

COMMENT: ASWFC HF Communications Warning 51 was issued on 23 
May and is current for 23-25 May. Maximum usable frequencies 
(MUFs) in the Australian region on UT day 23-May were near predicted 
monthly values to 15-30% depressed. Spread F was observed at 
Hobart during local night hours. MUFs are expected to be near 
predicted monthly values to 15% depressed over 24-26 May. 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