[Ips-dhfpr] ASWFC Daily HF Prop Report - 01 April 26 issued 2330 UT on 01 Apr 2026 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/01 APRIL 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (01 APRIL) 
Date   T index  Conditions    
01 Apr   116    Normal         

Flares: none.

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Enhanced by 85% during local night.
   Niue Island Region:
      Enhanced by 30% during local day.
      Near predicted monthly values during local night.
   Northern Australian Region:
      Enhanced by 15% during local day.
      Enhanced by 35% during local night.
      Enhanced by 20% after local dawn.
   Southern Australian Region:
      Mostly near predicted monthly values.
      Enhanced by 25% after local dawn.
   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 (02 APRIL - 04 APRIL)
Date   T index  Conditions       MUFs                              
02 Apr   100    Normal           Near predicted monthly values 
                                 to 15% enhanced
03 Apr    90    Normal-fair      Near predicted monthly values    
04 Apr    70    Fair             Depressed 10 to 15%/near predicted 
                                 monthly values   

COMMENT: ASWFC Preliminary HF Communications Warning 31 was issued 
on 1 April and is current for 4 Apr only. Maximum usable frequencies 
(MUFs) in the Australian region on UT day 01-Apr were near predicted 
values to 35% enhanced. Strong local night enhancements were 
observed at Darwin. A weaker than expected CME has arrived later 
than expected inducing little geomagnetic activity. MUFs are 
now expected to be near predicted monthly values to 15% enhanced for 
02-Apr. A coronal hole wind stream is expected to increase geomagnetic 
activity on 03-Apr. Southern Australian MUFs may become mildly 
(15%) depressed on 04-Apr. Isolated minor short wave 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