[Ips-dhfpr] ASWFC Daily HF Prop Report - 28 April 25 issued 2331 UT on 28 Apr 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/28 APRIL 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (28 APRIL) 
Date   T index  Conditions    
28 Apr   131    Fair-normal    

Flares: none.

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

PCA Event : No event.

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


2. FORECAST (29 APRIL - 01 MAY)
Date   T index  Conditions       MUFs                              
29 Apr   125    Normal           Near predicted monthly values
30 Apr   125    Normal           Near predicted monthly values    
01 May   125    Normal-fair      Near predicted monthly values   

COMMENT: Maximum usable frequencies (MUFs) in the Australian 
region on UT day 28-Apr were near predicted monthly values. Spread 
F was observed at Hobart during local night hours. Ionospheric 
equatorial scintillation was observed during the interval 28/0855-1320UT 
at Darwin, Weipa and Niue. MUFs are expected to be near predicted 
monthly values over 29-Apr to 01-May. Southern Australian region 
HF conditions may become mildly degraded during local night hours 
01-02 May. Isolated minor fadeouts possible.

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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