[Ips-dhfpr] ASWFC Daily HF Prop Report - 20 March 26 issued 2330 UT on 20 Mar 2026 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/20 MARCH 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (20 MARCH) 
Date   T index  Conditions    
20 Mar    95    Normal-fair    

Flares: none.

MUFs:
   Cocos Island Region:
      Enhanced by 25% during local day.
      Enhanced by 30% during local night.
   Niue Island Region:
      Near predicted monthly values during local day.
      No data available during local night.
   Northern Australian Region:
      Mostly near predicted monthly values.
   Southern Australian Region:
      Mostly 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      98
Mar      87
Apr      85


2. FORECAST (21 MARCH - 23 MARCH)
Date   T index  Conditions       MUFs                              
21 Mar    55    Fair             Depressed by up to 20%
22 Mar    65    Normal-fair      Depressed by up to 20%    
23 Mar    80    Normal           Near predicted monthly values 
                                 to 15% depressed   

COMMENT: ASWFC Preliminary HF Communications Warning 27 was issued 
on 19 March and is current for 20-21 Mar. Maximum usable frequencies 
(MUFs) in the Australian region on UT day 20-Mar were near predicted 
values. Some spread-F was observed in Hobart during local night 
hours. MUFs are expected to become depressed by 20% early on 
21-Mar and continue through to 23-Mar but improving on this last 
day. Spread-F is possible at middle and high latitudes and scintillation 
may be possible in equatorial regions. The source of this activity 
is an anticipated CME from 18-Mar coupled with coronal hole activity.

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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