[Ips-dhfpr] ASWFC Daily HF Prop Report - 04 April 26 issued 2330 UT on 04 Apr 2026 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/04 APRIL 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (04 APRIL) 
Date   T index  Conditions    
04 Apr    63    Poor           

Flares    Max     Fadeout    Freq.  Sectors
  M7.5    0117UT  probable   lower  West Pacific
  M1.7    0759UT  possible   lower  Mid East/Indian
  M1.3    1211UT  possible   lower  European
  M1.0    2304UT  possible   lower  West Pacific

MUFs:
   Cocos Island Region:
      Enhanced by 40% during local day.
      Enhanced by 50% during local night.
      Enhanced by 20% after local dawn.
   Niue Island Region:
      Enhanced by 30% during local day.
      Enhanced by 25% during local night.
   Northern Australian Region:
      Depressed by 20% during local day.
      Depressed by 15% during local night.
   Southern Australian Region:
      Depressed by 35% during local day.
      Depressed by 20% 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 (05 APRIL - 07 APRIL)
Date   T index  Conditions       MUFs                              
05 Apr    65    Fair             Depressed 10 to 15%/near predicted 
                                 monthly values
06 Apr    80    Normal-fair      Near predicted monthly values    
07 Apr    85    Normal           Near predicted monthly values   

COMMENT: ASWFC HF Communications Warning 33 was issued on 3 April 
and is current for 4-5 Apr. ASWFC SWF HF Communications Warning 
34 was issued on 3 April and is current for 4-5 Apr. Maximum 
Usable Frequencies (MUFs) were depressed by 20-35% in the Australian 
region during 04-Apr, due to ongoing geomagnetic activity. Enhancements 
were observed at Niue Island and the Cocos Islands, whilst MUFs 
in the Antarctic region were near predicted monthly values. Spread 
F was observed in Perth and Townsville, and strong sporadic E 
was observed in Canberra, Hobart, Perth, Townsville, and Norfolk 
Island. MUFs are expected to be 10-15% depressed on UT day 05-Apr, 
recovering to near predicted monthly values by 06-07 Apr as the 
effects of current geomagnetic activity subside. 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