[Ips-dhfpr] ASWFC Daily HF Prop Report - 15 April 26 issued 2330 UT on 15 Apr 2026 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/15 APRIL 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (15 APRIL) 
Date   T index  Conditions    
15 Apr    61    Fair-normal    

Flares: none.

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Depressed by 35% during local night.
   Niue Island Region:
      Near predicted monthly values during local day.
      Depressed by 15% during local night.
      Depressed by 20% after local dawn.
   Northern Australian Region:
      Mostly near predicted monthly values.
   Southern Australian Region:
      Near predicted monthly values 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 (16 APRIL - 18 APRIL)
Date   T index  Conditions       MUFs                              
16 Apr    70    Normal           Depressed 10 to 15%/near predicted 
                                 monthly values
17 Apr    70    Normal-fair      Depressed 10 to 15%/near predicted 
                                 monthly values    
18 Apr    70    Fair             Depressed 10 to 15%/near predicted 
                                 monthly values   

COMMENT: Maximum Usable Frequencies (MUFs) in the Australian 
region on UT day 15-Apr were depressed 20% to near predicted 
values. Spread-F was observed at Hobart and Canberra during local 
night hours. MUFs are expected to be 15% depressed to near predicted 
monthly values over 16-18 Apr. Degraded HF conditions may be 
experienced for the southern Australian region from 18-Apr in 
association with anticipated geomagnetic activity induced by 
a coronal hole wind stream.

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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