[Ips-dhfpr] ASWFC Daily HF Prop Report - 18 March 23 issued 2330 UT on 18 Mar 2023 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/18 MARCH 2023
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (18 MARCH) 
Date   T index  Conditions    
18 Mar   133    Normal         

Flares: none.

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Enhanced by 30% during local night.
      Enhanced by 25% after local dawn.
   Niue Island Region:
      Enhanced by 35-70%.
   Northern Australian Region:
      Enhanced by 15-20% 
   Southern Australian Region:
      Enhanced by 25-30% 
   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 (19 MARCH - 21 MARCH)
Date   T index  Conditions       MUFs                              
19 Mar   125    Normal-poor      15 to 30% above predicted monthly 
                                 values
20 Mar    80    Poor-fair        Depressed 15%/15% above predicted 
                                 monthly values    
21 Mar   100    Fair-normal      Near predicted monthly values   

COMMENT: ASWFC Preliminary HF Communications Warning 30 was issued 
on 18 March and is current for 20 Mar only. Maximum usable frequencies 
(MUFs) on UT day 18-Mar in the Australian region were enhanced 
by 15-70%. MUFs are expected to be enhanced by 15-30% on 19-Mar. 
Southern Australian region MUFs are expected to become depressed 
on 20-Mar if geomagnetic activity induced from a recent erupting 
solar filament eventuates. Northern Australian region MUFs are 
expected to remain enhanced. Isolated minor fadeouts possible.

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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