[Ips-dhfpr] ASWFC Daily HF Prop Report - 21 May 26 issued 2330 UT on 21 May 2026 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/21 MAY 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (21 MAY) 
Date   T index  Conditions    
21 May    50    Normal         

Flares: none.

MUFs:
   Cocos Island Region:
      No data available during local day.
      No data available 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.
   Antarctic Region (Casey/Davis/Mawson):
      Near predicted monthly values over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Apr      74
May      71
Jun      68


2. FORECAST (22 MAY - 24 MAY)
Date   T index  Conditions       MUFs                              
22 May    50    Normal           Depressed 15%/near predicted 
                                 monthly values
23 May    50    Normal           Depressed 15%/near predicted 
                                 monthly values    
24 May    50    Normal           Depressed 15%/near predicted 
                                 monthly values   

COMMENT: Maximum Usable Frequencies (MUFs) on UT day were depressed 
by up to 20% during local night hours in the northern Australian 
region MUFs were near predicted monthly values in the southern 
Australian region. Spread-F was observed at Hobart and Canberra 
during local night hours. MUFs are expected to be near predicted 
monthly values to depressed by up to 15% over 22-24 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