[Ips-dhfpr] ASWFC Daily HF Prop Report - 23 April 26 issued 2330 UT on 23 Apr 2026 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/23 APRIL 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (23 APRIL) 
Date   T index  Conditions    
23 Apr    55    Fair-normal    

Flares    Max     Fadeout    Freq.  Sectors
  M1.6    0435UT  possible   lower  E. Asia/Aust.
  M4.3    0848UT  possible   lower  Mid East/Indian
  M1.7    1400UT  possible   lower  South American/
                                    Atlantic
  M4.9    1708UT  possible   lower  South American/
                                    Atlantic

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 30% 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 30% 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
Mar      92
Apr      83
May      81


2. FORECAST (24 APRIL - 26 APRIL)
Date   T index  Conditions       MUFs                              
24 Apr    70    Normal-fair      Near predicted monthly values
25 Apr    75    Normal-fair      Near predicted monthly values    
26 Apr    80    Fair             Near predicted monthly values   

COMMENT: Maximum Usable Frequencies (MUFs) in the Australian 
region were near predicted monthly values during local daylight 
hours, with depressions of 20-30% reported during local night 
hours. Spread-F was observed at Canberra, and sporadic-E was 
observed at Darwin during local night hours. MUFs are expected 
to remain near monthly predicted values over 24-25 Apr, with 
depressions likely on 26-Apr due to forecast geomagnetic activity. 
Mild depressions are possible during local night hours, and 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