[Ips-dhfpr] ASWFC Daily HF Prop Report - 09 April 25 issued 2331 UT on 09 Apr 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/09 APRIL 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (09 APRIL) 
Date   T index  Conditions    
09 Apr   133    Fair-normal    

Flares: none.

MUFs:
   Cocos Island Region:
      Enhanced by 25% during local day.
      Near predicted monthly values during local night.
   Niue Island Region:
      Mostly near predicted monthly values.
      Enhanced by 20% after local dawn.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 15% during local night.
      Enhanced by 20% after local dawn.
   Southern Australian Region:
      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 (10 APRIL - 12 APRIL)
Date   T index  Conditions       MUFs                              
10 Apr   125    Normal-fair      Briefly 15% depressed after 
                                 dawn to near predicted monthly 
                                 values to 15% enhanced
11 Apr   125    Normal-fair      Briefly 15% depressed after 
                                 dawn to near predicted monthly 
                                 values to 15% enhanced    
12 Apr   145    Normal           Near predicted monthly values 
                                 to 15% enhanced   

COMMENT: ASWFC SWF HF Communications Warning 35 was issued on 
8 April and is current for 9-10 Apr. Maximum usable frequencies 
(MUFs) in the Australian region on UT day 9-Apr were near predicted 
values to 20% enhanced. Strong spread-F was observed at Hobart 
during local night hours. MUFs are expected to be generally near 
predicted values over 10-12 Apr. MUFs in the southern Australian 
region may be briefly depressed by 15-20% after local dawn due 
to ongoing mild geomagnetic activity. Northern Australian region 
MUFs are expected to be 15% enhanced.

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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