[Ips-dhfpr] ASWFC Daily HF Prop Report - 13 March 25 issued 2331 UT on 13 Mar 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/13 MARCH 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (13 MARCH) 
Date   T index  Conditions    
13 Mar    88    Poor-fair      

Flares: none.

MUFs:
   Cocos Island Region:
      Depressed by 15% during local day.
      Depressed by 45% during local night.
      Enhanced by 20% after local dawn.
   Niue Island Region:
      Enhanced by 20% during local day.
      Near predicted monthly values during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Depressed by 15% during local night.
   Southern Australian Region:
      Depressed by 20% during local day.
      Near predicted monthly values during local night.
      Depressed by 25% after local dawn.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 25% over the UT day.

PCA Event : No event.

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


2. FORECAST (14 MARCH - 16 MARCH)
Date   T index  Conditions       MUFs                              
14 Mar    90    Fair             Depressed 15%/near predicted 
                                 monthly values
15 Mar   100    Normal-fair      Near predicted monthly values    
16 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 near predicted monthly values to 
depressed by 25% in the southern Australian region and by 15% 
in the northern Australian region. Spread F was observed at Hobart 
and sporadic E was observed at Brisbane and Hobart. MUFs are 
expected to be near monthly predicted values to depressed by 
up to 15% on 15-Mar. MUFs are expected to be near predicted monthly 
values over 15-16 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