[Ips-dhfpr] ASWFC Daily HF Prop Report - 16 April 25 issued 2330 UT on 16 Apr 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/16 APRIL 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (16 APRIL) 
Date   T index  Conditions    
16 Apr   102    Fair           

Flares: none.

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Enhanced by 15% during local night.
   Niue Island Region:
      Near predicted monthly values during local day.
      Depressed by 15% during local night.
   Northern Australian Region:
      Mostly near predicted monthly values.
   Southern Australian Region:
      Mostly near predicted monthly values.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 25% over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Mar      126
Apr      115
May      113


2. FORECAST (17 APRIL - 19 APRIL)
Date   T index  Conditions       MUFs                              
17 Apr    75    Normal-fair      Depressed 30 to 40%/near predicted 
                                 monthly values
18 Apr    90    Normal           Depressed 10 to 20%/near predicted 
                                 monthly values    
19 Apr   100    Normal           Depressed 10 to 20%/near predicted 
                                 monthly values   

COMMENT: ASWFC HF Communications Warning 40 was issued on 16 
April and is current for 17-19 Apr. Maximum usable frequencies 
(MUFs) on UT day 16-Apr were mostly near predicted values. Spread-F 
was observed in Hobart. HF radio conditions are expected to become 
depressed by 30-40% on UT day 17-Apr due to recent geomagnetic 
activity. Conditions are likely to be degraded and further spread-F 
is expected. High latitude scintillation is 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