[Ips-dhfpr] ASWFC Daily HF Prop Report - 12 April 25 issued 2330 UT on 12 Apr 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/12 APRIL 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (12 APRIL) 
Date   T index  Conditions    
12 Apr   137    Normal-fair    

Flares    Max     Fadeout    Freq.  Sectors
  M1.0 11/2220UT  possible   lower  East Pacific/
                                    North American
  M1.1    0445UT  possible   lower  E. Asia/Aust.
  M1.2    0549UT  possible   lower  E. Asia/Aust.
  M1.0    0719UT  possible   lower  Mid East/Indian
  M2.0    1117UT  possible   lower  European
  M2.7    1143UT  possible   lower  European
  M1.3    1512UT  possible   lower  South American/
                                    Atlantic
  M1.6    2203UT  possible   lower  East Pacific/
                                    North American

MUFs:
   Cocos Island Region:
      Enhanced by 15% during local day.
      Enhanced by 35% during local night.
   Niue Island Region:
      Near predicted monthly values during local day.
      Enhanced by 25% during local night.
      Enhanced by 25% after local dawn.
   Northern Australian Region:
      Mostly near predicted monthly values.
      Enhanced by 20% after local dawn.
   Southern Australian Region:
      Mostly near predicted monthly values.
      Depressed by 30% after local dawn.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 15% over the UT day.

PCA Event : No event.

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


2. FORECAST (13 APRIL - 15 APRIL)
Date   T index  Conditions       MUFs                              
13 Apr   140    Normal-fair      Near predicted monthly values 
                                 to 15% enhanced
14 Apr   140    Normal-fair      Near predicted monthly values 
                                 to 15-20% enhanced    
15 Apr   140    Normal-fair      Near predicted monthly values 
                                 to 15-20% enhanced   

COMMENT: ASWFC SWF HF Communications Warning 36 was issued on 
10 April and is current for 11-13 Apr. Maximum usable frequencies 
(MUFs) in the Australian region on UT day 12-Apr were near predicted 
values to 20% enhanced, although some moderate depressions were 
observed in the southern region. Spread-F was observed in Hobart. 
MUFs are expected to be near predicted values over 13-15 Ape, 
with enhancements up to 15-20%.

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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