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

[Australian Space Weather Forecasting Centre]

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

1. SUMMARY (21 APRIL) 
Date   T index  Conditions    
21 Apr    34    Fair           

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 25% during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 35% during local night.
   Southern Australian Region:
      Depressed by 40% during local day.
      Depressed by 40% during local night.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 25% over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Mar      92
Apr      83
May      81


2. FORECAST (22 APRIL - 24 APRIL)
Date   T index  Conditions       MUFs                              
22 Apr    65    Normal-fair      Near predicted monthly values 
                                 to 10-20% depressed
23 Apr    85    Normal-fair      Near predicted monthly values 
                                 to 10-15% depressed    
24 Apr   100    Normal           Near predicted monthly values   

COMMENT: Maximum usable frequencies on UT day 21-Apr were near 
predicted monthly values to 40% depressed. Sites along the east 
coast of Australia were degraded during local night hours, with 
strong spread-F, sporadic-E and weak signals. MUFs are expected 
to begin recovering on 22-Apr, although depressions of 10-20% 
are still possible at local dawn hours. This may continue into 
23-Apr, before returning to normal on 24-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