[Ips-dhfpr] ASWFC Daily HF Prop Report - 22 April 23 issued 2330 UT on 22 Apr 2023 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/22 APRIL 2023
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (22 APRIL) 
Date   T index  Conditions    
22 Apr   116    Normal         

Flares: none.

MUFs:
   Cocos Island Region:
      Enhanced by 25% during local day.
      Enhanced by 95% during local night.
   Niue Island Region:
      Near predicted monthly values during local day.
      Enhanced by 25% 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.
      Near predicted monthly values during local night.
      Enhanced by 20% after local dawn.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Enhanced by 15% over the UT day.

PCA Event : No event.

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


2. FORECAST (23 APRIL - 25 APRIL)
Date   T index  Conditions       MUFs                              
23 Apr   105    Poor             Near predicted monthly values
24 Apr    60    Fair             Depressed 15%/near predicted 
                                 monthly values    
25 Apr    95    Normal           Near predicted monthly values   

COMMENT: ASWFC Preliminary HF Communications Warning 38 was issued 
on 22 April and is current for 23-24 Apr. Maximum usable frequencies 
(MUFs) on UT day 22-Apr in the Australian region were enhanced 
by 15-20%. Sporadic-E was observed at Brisbane, Learmonth and 
Perth. Spread F was observed at Hobart and Perth during local 
night hours. MUFs are expected to be near predicted monthly values 
on 23 and 25-Apr. MUFs are expected to be depressed by 15% on 
24-Apr due to a CME impact on 23-Apr.

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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