[Ips-dhfpr] ASWFC Daily HF Prop Report - 25 April 24 issued 2330 UT on 25 Apr 2024 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/25 APRIL 2024
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (25 APRIL) 
Date   T index  Conditions    
25 Apr   144    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M1.1 24/2250UT  possible   lower  East Pacific/
                                    North American
  M2.0 24/2259UT  possible   lower  East Pacific/
                                    North American
  M1.0    0149UT  possible   lower  West Pacific
  M1.0    1321UT  possible   lower  European
  M1.3    1712UT  possible   lower  South American/
                                    Atlantic

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Enhanced by 85% during local night.
   Niue Island Region:
      Enhanced by 30% during local day.
      Enhanced by 65% during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 20% during local night.
   Southern Australian Region:
      Enhanced by 15% during local day.
      Enhanced by 15% during local night.
   Antarctic Region (Casey/Davis/Mawson):
      Enhanced by 15% over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Mar      120
Apr      114
May      115


2. FORECAST (26 APRIL - 28 APRIL)
Date   T index  Conditions       MUFs                              
26 Apr   140    Normal           Near predicted monthly values
27 Apr   135    Normal-fair      Near predicted monthly values    
28 Apr   135    Normal-fair      Near predicted monthly values   

COMMENT: ASWFC SWF HF Communications Warning 41 was issued on 
25 April and is current for 25-26 Apr. Maximum usable frequencies 
(MUFs) in the Australian region were near predicted monthly values 
to 20% enhanced on UT day 25-Apr. Significant signal spreading, 
both in range and frequency, was observed in Darwin and Niue 
during local night hours. This was likely associated with strong 
equatorial scintillation that was observed at Darwin, Niue and 
Weipa between 25/0724-1439 UT. Spread-F was also observed in 
Hobart during local night hours. MUFs are expected to be near 
predicted values over 26-28 Apr, with a slight chance for mild 
depressions during local night hours due to possible coronal 
hole activity.

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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