[Ips-dhfpr] ASWFC Daily HF Prop Report - 17 March 25 issued 2330 UT on 17 Mar 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/17 MARCH 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (17 MARCH) 
Date   T index  Conditions    
17 Mar   126    Normal-fair    

Flares    Max     Fadeout    Freq.  Sectors
  M1.0    1934UT  possible   lower  East Pacific/
                                    North American

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Enhanced by 25% during local night.
   Niue Island Region:
      Enhanced by 30% during local day.
      Enhanced by 60% during local night.
   Northern Australian Region:
      Mostly near predicted monthly values.
      Enhanced by 25% after local dawn.
   Southern Australian Region:
      Near predicted monthly values.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 15% over the UT day.

PCA Event : No event.

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


2. FORECAST (18 MARCH - 20 MARCH)
Date   T index  Conditions       MUFs                              
18 Mar   135    Normal           Near to 15% above predicted 
                                 monthly values
19 Mar   140    Normal           Near to 15% above predicted 
                                 monthly values    
20 Mar   130    Normal-fair      Near predicted monthly values   

COMMENT: Maximum usable frequencies (MUFs) on UT day 16-Mar were 
mostly near predicted values, with enhancements of up to 25% 
observed in the northern Australian region. Sporadic-E was observed 
at Brisbane, Canberra and Perth. Spread F was observed at Hobart. 
MUFs are expected to be near predicted monthly values to 15% 
enhanced over 18-19 Mar. MUFs are expected to be near predicted 
monthly values on 20-Mar due to possible geomagnetic activity. 
Minor shortwave fadeouts are possible.

----------------------------------------------------------
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