[Ips-dhfpr] ASWFC Daily HF Prop Report - 28 April 26 issued 2330 UT on 28 Apr 2026 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/28 APRIL 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (28 APRIL) 
Date   T index  Conditions    
28 Apr    75    Normal-fair    

Flares    Max     Fadeout    Freq.  Sectors
  M1.0    1223UT  possible   lower  European
  M1.5    1353UT  possible   lower  European
  M1.1    1407UT  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 20% 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 (29 APRIL - 01 MAY)
Date   T index  Conditions       MUFs                              
29 Apr    80    Normal           Near predicted monthly values
30 Apr    70    Normal-fair      Near predicted monthly values    
01 May    70    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 28-Apr, with depressions of around 
20% observed at Niue Island during local night hours. Spread-F 
was observed at Hobart, and sporadic-E was observed in Canberra. 
Ionospheric scintillation was observed at Darwin between 28/1338-1510UT. 
MUFs are expected to remain near predicted values on 29-Apr, 
with some small depressions possible on 30-Apr and 01-May due 
to forecast geomagnetic activity. Shortwave fadeouts are possible.

----------------------------------------------------------
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