[Ips-dhfpr] ASWFC Daily HF Prop Report - 18 March 26 issued 2330 UT on 18 Mar 2026 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/18 MARCH 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (18 MARCH) 
Date   T index  Conditions    
18 Mar    87    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M2.7    0842UT  possible   lower  Mid East/Indian

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Depressed by 15% during local night.
   Niue Island Region:
      Near predicted monthly values during local day.
      Depressed by 20% 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
Feb      98
Mar      87
Apr      85


2. FORECAST (19 MARCH - 21 MARCH)
Date   T index  Conditions       MUFs                              
19 Mar    80    Normal-fair      Near predicted monthly values, 
                                 depressed 15% late in UT day.
20 Mar    60    Fair             Depressed by up to 20%    
21 Mar    60    Fair             Depressed by up to 20%   

COMMENT: Maximum usable frequencies (MUFs) in the Australian 
region on UT day 18-Mar were near predicted monthly values. MUFs 
are expected to be near predicted monthly values for most of 
the UT day 19-Mar, then becoming 15% depressed late in the UT 
day (after local dawn 20-Mar). Australian regional MUFs are expected 
to be depressed by up to 20% over 20-21 Mar due to an anticipated 
increase in geomagnetic activity from two CME arrivals and coronal 
hole wind streams.

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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