[Ips-dhfpr] ASWFC Daily HF Prop Report - 22 May 26 issued 2330 UT on 22 May 2026 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/22 MAY 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (22 MAY) 
Date   T index  Conditions    
22 May    59    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 15% 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 during local day.
      Depressed by 20% during local night.
   Antarctic Region (Casey/Davis/Mawson):
      Enhanced by 15% over the UT day.

PCA Event : No event.

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


2. FORECAST (23 MAY - 25 MAY)
Date   T index  Conditions       MUFs                              
23 May    55    Normal           Near predicted monthly values
24 May    55    Normal           Near predicted monthly values    
25 May    55    Normal           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 and southern 
Australian region. Spread-F was observed at Hobart and Canberra 
during local night hours. MUFs are expected to be near predicted 
monthly values over 23-25 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