[Ips-dhfpr] ASWFC Daily HF Prop Report - 28 April 23 issued 2331 UT on 28 Apr 2023 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/28 APRIL 2023
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (28 APRIL) 
Date   T index  Conditions    
28 Apr   107    Normal         

Flares: none.

MUFs:
   Cocos Island Region:
      Enhanced by 45% during local day.
      Enhanced by 25% during local night.
      Enhanced by 25% after local dawn.
   Niue Island Region:
      Enhanced by 15% during local day.
      Enhanced by 20% during local night.
   Northern Australian Region:
      Enhanced by 20% during local day.
      Near predicted monthly values during local night.
   Southern Australian Region:
      Enhanced by 15% during local day.
      Near predicted monthly values during local night.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Depressed by 20% over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Mar      132
Apr      84
May      84


2. FORECAST (29 APRIL - 01 MAY)
Date   T index  Conditions       MUFs                              
29 Apr   110    Normal           Near to 15% above predicted 
                                 monthly values
30 Apr   110    Normal           Near to 15% above predicted 
                                 monthly values    
01 May   110    Normal           Near to 15% above predicted 
                                 monthly values   

COMMENT: ASWFC SWF HF Communications Warning 40 was issued on 
28 April and is current for 28-30 Apr. Maximum usable frequencies 
(MUFs) on UT day 28-Apr in the Australian region were near predicted 
monthly values to 20% enhanced during local day. Strong spread 
F was observed at Hobart during local night hours. Significant 
spread E was observed at Brisbane and Mawson, with some spread 
E observed at Cocos Islands, Hobart and Perth all during local 
night hours. MUFs are expected to be near predicted monthly values 
to 15% enhanced over 29-Apr to 1-May. Shortwave fadeouts are 
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