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

[Regional Warning Centre]

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

1. SUMMARY (18 APRIL) 
Date   T index  Conditions    
18 Apr   117    Normal         

Flares: none.

MUFs:
   Cocos Island Region:
      Enhanced by 25% during local day.
      Enhanced by 45% during local night.
   Niue Island Region:
      Enhanced by 20% during local day.
      Enhanced by 30% during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 15% during local night.
   Southern Australian Region:
      Enhanced by 20% during local day.
      Enhanced by 15-20% during local night and after local dawn.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Enhanced by 30% over the UT day.

PCA Event : No event.

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


2. FORECAST (19 APRIL - 21 APRIL)
Date   T index  Conditions       MUFs                              
19 Apr   120    Normal-fair      15-20% above predicted monthly 
                                 values
20 Apr   120    Normal           15-20% above predicted monthly 
                                 values    
21 Apr   120    Normal           15-20% above predicted monthly 
                                 values   

COMMENT: ASWFC SWF HF Communications Warning 37 was issued on 
16 April and is current for 17-19 Apr. Maximum usable frequencies 
(MUFs) on UT day 18-Apr in the Australian region were enhanced 
by 15-25%. Spread F was observed during local night hours at 
Hobart. MUFs are expected to be 15-20% enhanced over 19-21 Apr. 
Isolated shortwave fadeouts are possible. Mildly degraded conditions 
are possible during local night hours on 19-Apr for southern 
Australian regions due to possible arrival of a weak CME component.

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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