[Ips-dhfpr] ASWFC Daily HF Prop Report - 17 April 23 issued 2330 UT on 17 Apr 2023 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/17 APRIL 2023
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (17 APRIL) 
Date   T index  Conditions    
17 Apr   119    Normal         

Flares: none.

MUFs:
   Cocos Island Region:
      Enhanced by 25% during local day.
      Enhanced by 100% during local night.
      Enhanced by 20% after local dawn.
   Niue Island Region:
      Enhanced by 20% during local day.
      Enhanced by 20-30% during local night and after local dawn.
   Northern Australian Region:
      Mostly near predicted monthly values.
   Southern Australian Region:
      Enhanced by 15% during local day.
      Enhanced by 20-25% during local night and after local dawn.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Enhanced by 20% over the UT day.

PCA Event : No event.

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


2. FORECAST (18 APRIL - 20 APRIL)
Date   T index  Conditions       MUFs                              
18 Apr   115    Normal           15-20% above predicted monthly 
                                 values
19 Apr   115    Normal-fair      15-20% above predicted monthly 
                                 values    
20 Apr   115    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 17-Apr in the Australian region were enhanced 
by 15-25%. Strong enhancements were observed at Cocos Island. 
Spread F was observed during local night hours at Hobart. MUFs 
are expected to be 15-20% enhanced over 18-20 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