[Ips-dhfpr] ASWFC Daily HF Prop Report - 21 March 25 issued 2346 UT on 21 Mar 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/21 MARCH 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (21 MARCH) 
Date   T index  Conditions    
21 Mar   151    Fair-normal    

Flares    Max     Fadeout    Freq.  Sectors
  M1.2    1558UT  possible   lower  South American/
                                    Atlantic

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

PCA Event : No event.

Monthly T index:
Month  T index
Feb      127
Mar      117
Apr      114


2. FORECAST (22 MARCH - 24 MARCH)
Date   T index  Conditions       MUFs                              
22 Mar   135    Fair-normal      Near predicted monthly values 
                                 to 15% enhanced
23 Mar   135    Fair-normal      Near predicted monthly values 
                                 to 15% enhanced    
24 Mar   135    Normal           Near predicted monthly values 
                                 to 15% enhanced   

COMMENT: Maximum usable frequencies (MUFs) in the Australian 
region on UT day 21-Mar were near predicted values to 15% enhanced. 
Enhancements of up to 30% have been observed after dawn this 
morning at some Australian east coast sites. Mild spread-F was 
observed in Hobart during local night hours. Scintillation was 
observed at Weipa during the interval 21/1151-1310UT. MUFs are 
expected to be generally near predicted values to 15% enhanced 
over 22-24 Mar, with brief mild depressions of 15% possible after 
local dawn for the southern Australian region during 23-24 Mar.

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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