[Ips-dhfpr] ASWFC Daily HF Prop Report - 18 April 25 issued 2331 UT on 18 Apr 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/18 APRIL 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (18 APRIL) 
Date   T index  Conditions    
18 Apr   116    Fair-normal    

Flares: none.

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Depressed by 20% during local night.
   Niue Island Region:
      Enhanced by 25%.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian Region:
      Near predicted monthly values.
      Hobart depressed 15-20% after dawn.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 20% over the UT day.

PCA Event : No event.

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


2. FORECAST (19 APRIL - 21 APRIL)
Date   T index  Conditions       MUFs                              
19 Apr   115    Normal           Near predicted monthly values
20 Apr   115    Normal           Near predicted monthly values    
21 Apr   115    Normal-fair      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) in the Australian region were generally near predicted 
monthly values. Spread F was observed during local night hours 
at Hobart. MUFs at Hobart were depressed 15-20% after local dawn 
this morning and are expected to gradually recover. MUFs are 
generally expected near predicted monthly values over 19-21 Apr.

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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