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

[Australian Space Weather Forecasting Centre]

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

1. SUMMARY (20 APRIL) 
Date   T index  Conditions    
20 Apr    63    Normal-fair    

Flares: none.

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      No data available during local night.
   Niue Island Region:
      Near predicted monthly values during local day.
      Enhanced by 20% during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 25% during local night.
   Southern Australian Region:
      Mostly 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
Mar      92
Apr      83
May      81


2. FORECAST (21 APRIL - 23 APRIL)
Date   T index  Conditions       MUFs                              
21 Apr    78    Normal-fair      Near predicted monthly values 
                                 to 10-15% depressed
22 Apr    85    Normal           Near predicted monthly values    
23 Apr    90    Normal           Near predicted monthly values   

COMMENT: Maximum usable frequencies (MUFs) on UT day were near 
predicted monthly values to 25% depressed. Spread-F was observed 
in Hobart during local night and dawn hours. Sporadic-E was observed 
in Niue, as well as a scintillation event from 0811-0829 UT. 
Conditions in Brisbane were degraded. MUFs are expected to mostly 
be near predicted values over 21-23 Apr, with some ongoing depressions 
of 10-15% on 21-Apr.

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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