[Ips-dhfpr] ASWFC Daily HF Prop Report - 11 May 26 issued 2330 UT on 11 May 2026 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/11 MAY 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (11 MAY) 
Date   T index  Conditions    
11 May    52    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 25% 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 15% 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      74
May      71
Jun      68


2. FORECAST (12 MAY - 14 MAY)
Date   T index  Conditions       MUFs                              
12 May    60    Normal           Near predicted monthly values
13 May    60    Normal           Near predicted monthly values    
14 May    60    Normal           Near predicted monthly values   

COMMENT: ASWFC SWF HF Communications Warning 47 was issued on 
10 May and is current for 11-13 May. Maximum Usable Frequencies 
(MUFs) in the Australian region were mostly near predicted monthly 
values during daylight hours, with depressions of 15-25% observed 
during local night hours. Some spread F was observed at Norfolk 
Island, and some sporadic E was observed at Darwin during local 
night hours. Depressions of 25-35%, and spread F was also observed 
at Niue Island. MUFs are expected to be near predicted values 
over 12-14 May, with some mild depressions possible during night 
hours. 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