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

[Australian Space Weather Forecasting Centre]

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

1. SUMMARY (12 MARCH) 
Date   T index  Conditions    
12 Mar    99    Fair-poor      

Flares: none.

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Depressed by 25% during local night.
   Niue Island Region:
      Enhanced by 15% during local day.
      Near predicted monthly values during local night.
   Northern Australian Region:
      Mostly near predicted monthly values.
      Depressed by 20% after local dawn.
   Southern Australian Region:
      Depressed by 25% during local day.
      Depressed by 20% during local night.
      Depressed by 40% after local dawn.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 35% over the UT day.

PCA Event : No event.

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


2. FORECAST (13 MARCH - 15 MARCH)
Date   T index  Conditions       MUFs                              
13 Mar    85    Fair             15 to 20% below predicted monthly 
                                 values
14 Mar    95    Normal-fair      Depressed 15%/near predicted 
                                 monthly values    
15 Mar   100    Normal           Near predicted monthly values   

COMMENT: ASWFC HF Communications Warning 29 was issued on 12 
March and is current for 12-14 Mar. Maximum usable frequencies 
(MUFs) on UT day 12-Mar were depressed by 25-40% in the southern 
Australian region. MUFs were near predicted monthly values to 
depressed by 20% in the northern Australian region. Scintillation 
was observed at Darwin at around 1318UT. Spread F was observed 
at Hobart and sporadic E was observed at Brisbane. MUFs are expected 
to be 15-20% depressed over on 13-Mar. MUFs are expected to be 
near predicted monthly values to 15% depressed on 14-Mar and 
near predicted monthly values on 15-Mar. The most significant 
depressions are expected in the southern Australian region. Spread-F 
may be present at local night hours in high latitudes. Brief 
shortwave fadeouts are 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