[Ips-dhfpr] ASWFC Daily HF Prop Report - 21 March 26 issued 2330 UT on 21 Mar 2026 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/21 MARCH 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (21 MARCH) 
Date   T index  Conditions    
21 Mar    39    Fair           

Flares: none.

MUFs:
   Cocos Island Region:
      Depressed by 25% during local day.
      Depressed by 30% during local night.
   Niue Island Region:
      No data available during local day.
      No data available during local night.
   Northern Australian Region:
      Depressed by 15% during local day.
      Depressed by 30% during local night.
   Southern Australian Region:
      Depressed by 30% during local day.
      Depressed by 15% during local night.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 35% over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Feb      98
Mar      87
Apr      85


2. FORECAST (22 MARCH - 24 MARCH)
Date   T index  Conditions       MUFs                              
22 Mar    65    Normal-fair      Depressed by 10-20%
23 Mar    85    Fair             Depressed by 10-20%    
24 Mar    90    Normal-fair      Depressed by 10-20%   

COMMENT: ASWFC HF Communications Warning 28 was issued on 21 
March and is current for 22-24 Mar. Maximum usable frequencies 
(MUFs) in the Australian region on UT day 21-Mar were depressed 
up to 30% due to recent geomagnetic activity. Sporadic-E was 
observed in Hobart. MUFs are expected to be depressed on 22-Mar, 
however begin a slow recovery. MUFs may be depressed by 10-20% 
over 22-24 Mar. Due to the onset of another coronal hole by 23-Mar, 
MUFs are not expected to return to near predicted values in this 
forecast period.

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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