[Ips-dhfpr] ASWFC Daily HF Prop Report - 01 April 25 issued 2330 UT on 01 Apr 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/01 APRIL 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (01 APRIL) 
Date   T index  Conditions    
01 Apr   152    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M5.6    0646UT  possible   lower  Mid East/Indian
  M2.5    2231UT  possible   lower  East Pacific/
                                    North American

MUFs:
   Cocos Island Region:
      Enhanced by 25% during local day.
      Enhanced by 65% during local night.
   Niue Island Region:
      Enhanced by 30% during local day.
      Enhanced by 20% during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 25% during local night.
   Southern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 20% during local night.
      Enhanced by 20% after local dawn.
   Antarctic Region (Casey/Davis/Mawson):
      Near predicted monthly values over the UT day.
      Proton event in progress, increased absorption observed.

PCA Event : 10MeV Proton/PCA Event Began 31/1425UT and is in progress

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


2. FORECAST (02 APRIL - 04 APRIL)
Date   T index  Conditions       MUFs                              
02 Apr   140    Normal           About 15% above predicted monthly 
                                 values
03 Apr   140    Normal           About 15% above predicted monthly 
                                 values    
04 Apr   140    Normal-fair      About 15% above predicted monthly 
                                 values   

COMMENT: ASWFC SWF HF Communications Warning 33 was issued on 
31 March and is current for 1-3 Apr. Maximum usable frequencies 
(MUFs) in the Australian region on UT day 01-Apr were near predicted 
values to 25% enhanced. Ionospheric equatorial scintillation 
was observed at Weipa during the interval 01/1105-1120UT. A shortwave 
fadeout was observed 01/0639-0701UT. MUFs are generally expected 
to be near predicted values to 15% enhanced over 02-04 Apr. Shortwave 
fadeouts are expected on daylight HF circuits.

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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