[Ips-dhfpr] ASWFC Daily HF Prop Report - 27 April 26 issued 2330 UT on 27 Apr 2026 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/27 APRIL 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (27 APRIL) 
Date   T index  Conditions    
27 Apr    85    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M6.0 26/2257UT  probable   lower  East Pacific/
                                    North American
  M1.0    0645UT  possible   lower  Mid East/Indian

MUFs:
   Cocos Island Region:
      No data available during local day.
      No data available during local night.
   Niue Island Region:
      Enhanced by 15% during local day.
      Near predicted monthly values during local night.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian Region:
      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 (28 APRIL - 30 APRIL)
Date   T index  Conditions       MUFs                              
28 Apr    80    Normal           Near predicted monthly values
29 Apr    80    Normal           Near predicted monthly values    
30 Apr    80    Normal-fair      Near predicted monthly values   

COMMENT: ASWFC SWF HF Communications Warning 43 was issued on 
27 April and is current for 27-29 Apr. Maximum Usable Frequencies 
(MUFs) in the Australian and Antarctic regions were near predicted 
monthly values across UT day 27-Apr. Spread-F was observed at 
sites in the Southern Australian region. MUFs are expected to 
remain near predicted values over 28-29 Apr, with some small 
depressions possible on 30-Apr due to forecast geomagnetic activity. 
Shortwave fadeouts are probable.

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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