[Ips-dhfpr] ASWFC Daily HF Prop Report - 19 March 23 issued 2330 UT on 19 Mar 2023 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/19 MARCH 2023
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (19 MARCH) 
Date   T index  Conditions    
19 Mar   146    Normal         

Flares: none.

MUFs:
   Cocos Island Region:
      Enhanced by 35-80%.
   Niue Island Region:
      Enhanced by 20-35%.
   Northern Australian Region:
      Enhanced by 20-45%.
   Southern Australian Region:
      Enhanced by 25-40%.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Enhanced by 15% over the UT day.

PCA Event : No event.

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


2. FORECAST (20 MARCH - 22 MARCH)
Date   T index  Conditions       MUFs                              
20 Mar   130    Normal           15 to 30% above predicted monthly 
                                 values
21 Mar   130    Normal           15 to 30% above predicted monthly 
                                 values    
22 Mar   130    Normal           15 to 30% above 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 19-Mar in the Australian region were enhanced 
by 20-80%. MUFs are expected to be enhanced by 15-30%. Degraded 
HF communication conditions are now not expected as the anticipated 
increase in geomagnetic activity has failed to eventuate. Isolated 
minor fadeouts possible. Ionospheric scintillation was observed 
at Weipa during the interval 19/1256-1320UT.

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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