[Ips-dhfpr] ASWFC Daily HF Prop Report - 31 March 26 issued 2330 UT on 31 Mar 2026 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/31 MARCH 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (31 MARCH) 
Date   T index  Conditions    
31 Mar   108    Normal         

Flares: none.

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Enhanced by 20% during local night.
   Niue Island Region:
      Enhanced by 15% during local day.
      Enhanced by 15% during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 15% during local night.
   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 (01 APRIL - 03 APRIL)
Date   T index  Conditions       MUFs                              
01 Apr    60    Poor             20 to 30% below predicted monthly 
                                 values
02 Apr    60    Fair-poor        20 to 30% below predicted monthly 
                                 values    
03 Apr    60    Fair-poor        20 to 30% below predicted monthly 
                                 values   

COMMENT: ASWFC Preliminary HF Communications Warning 30 was issued 
on 31 March and is current for 31 Mar to 2 Apr. Maximum usable 
frequencies (MUFs) in the Australian region on UT day 31-Mar 
were generally near predicted values with enhancements of up 
to 15% during local night in the northern Australian region. 
Spread F was observed at Hobart during the local night. Sporadic 
E was also seen during the first half of the 31-Mar at Niue. 
MUFs are expected to be up to 30% depressed over 01-Apr to 03-Apr. 
Ionospheric depression is anticipated due to a CME expected to 
now arrive on the 01-Apr, followed by connection with a coronal 
hole on the 03-Apr. Isolated fadeouts are possible, due to flaring 
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