[Ips-dhfpr] ASWFC Daily HF Prop Report - 20 May 26 issued 2330 UT on 20 May 2026 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/20 MAY 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (20 MAY) 
Date   T index  Conditions    
20 May    48    Normal-fair    

Flares: none.

MUFs:
   Cocos Island Region:
      No data available during local day.
      No data available during local night.
   Niue Island Region:
      Depressed by 15% during local day.
      Depressed by 30% during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 20% during local night.
   Southern Australian Region:
      Depressed by 15% during local day.
      Depressed by 20% during local night.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 20% over the UT day.

PCA Event : No event.

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


2. FORECAST (21 MAY - 23 MAY)
Date   T index  Conditions       MUFs                              
21 May    55    Normal           Near predicted monthly values/depressed 
                                 5 to 15%
22 May    60    Normal           Near predicted monthly values/depressed 
                                 5 to 15%    
23 May    60    Normal           Near predicted monthly values/depressed 
                                 5 to 15%   

COMMENT: Maximum Usable Frequencies (MUFs) on UT day were depressed 
by up to 20% during local night hours and by up to 15% during 
local day hours in the southern Australian region. Spread-F and 
sporadic E were observed at Hobart, with milder spread-f observed 
at Canberra and Perth during local night hours. MUFs are expected 
to be near predicted monthly values over 21-23 May, with a chance 
of mild depressions, particularly in the southern Australian 
region.

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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