[Ips-dhfpr] ASWFC Daily HF Prop Report - 14 April 25 issued 2331 UT on 14 Apr 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/14 APRIL 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (14 APRIL) 
Date   T index  Conditions    
14 Apr   116    Fair-normal    

Flares: none.

MUFs:
   Cocos Island Region:
      Enhanced by 25% during local day.
      Enhanced by 45% during local night.
   Niue Island Region:
      Enhanced by 30% during local day.
      Near predicted monthly values during local night.
      Enhanced by 20% after local dawn.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian Region:
      Near predicted monthly values during local day.
      Southeast depressed by 25% during local night.
   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 (15 APRIL - 17 APRIL)
Date   T index  Conditions       MUFs                              
15 Apr   120    Normal-fair      Near predicted monthly values/depressed 
                                 5 to 15%
16 Apr    75    Fair             Depressed 15 to 20%/near predicted 
                                 monthly values    
17 Apr    95    Normal-fair      Depressed 10 to 15%/near predicted 
                                 monthly values   

COMMENT: ASWFC SWF HF Communications Warning 37 was issued on 
14 April and is current for 14-15 Apr. Maximum usable frequencies 
(MUFs) in the Australian region on UT day 14-Apr were generally 
near predicted values with depressions of 25% observed during 
local night hours for the southeast Australian region. Spread-F 
was observed during local night hours at Hobart. MUFs are expected 
to be initially near predicted monthly values on 15-Apr, with 
depressed conditions possible late in the UT day for the southern 
Australian region. Southern Australian region MUFs are expected 
to be depressed 15-20% on 16-Apr if CME induced geomagnetic storm 
activity eventuates late in the UT day on 15-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