[Ips-dhfpr] ASWFC Daily HF Prop Report - 23 March 23 issued 2330 UT on 23 Mar 2023 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/23 MARCH 2023
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (23 MARCH) 
Date   T index  Conditions    
23 Mar   141    Normal-poor    

Flares: none.

MUFs:
   Cocos Island Region:
      Enhanced by 20-85% 
   Niue Island Region:
      Enhanced by 40-55% 
   Northern Australian Region:
      Enhanced by 20-35% 
   Southern Australian Region:
      Enhanced by 30% during local day.
      Enhanced by 45% during local night.
      Depressed by 15% after local dawn.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Near predicted monthly values over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Feb      117
Mar      80
Apr      80


2. FORECAST (24 MARCH - 26 MARCH)
Date   T index  Conditions       MUFs                              
24 Mar    65    Poor-fair        20% depressed/20% enhanced
25 Mar    75    Normal-fair      15% depressed/20% enhanced    
26 Mar   125    Normal-fair      Near predicted monthly values/20% 
                                 enhanced   

COMMENT: Maximum usable frequencies (MUFs) on UT day 23-Mar in 
the Australian region were generally enhanced by 20-85%. Unexpected 
degraded HF conditions were observed during local night hours 
for southern region Australia with strong spread F observed at 
Canberra, Norfolk Island and Hobart. Aurora displays were seen 
at Canberra overnight in association with overnight geomagnetic 
storm activity. Southern region Australia MUFs are expected to 
be depressed 15-20% today following the overnight geomagnetic 
activity. MUFs for northern region Australia are expected to 
remain enhanced by 20-30% over the next three days. In general, 
degraded HF conditions during local night hours for southern 
region Australia are possible during 25-27 Mar due to an expected 
extended interval of mildly increased geomagnetic activity from 
a broad solar coronal hole.

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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