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

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/23 APRIL 2023
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (23 APRIL) 
Date   T index  Conditions    
23 Apr   115    Normal         

Flares: none.

MUFs:
   Cocos Island Region:
      Enhanced by 20% during local day.
      Near predicted monthly values during local night.
   Niue Island Region:
      Near predicted monthly values during local day.
      Enhanced by 35% during local night.
      Enhanced by 30% after local dawn.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 25% during local night.
   Southern Australian Region:
      Enhanced by 20% during local day.
      Enhanced by 20% during local night.
      Depressed by 35% after local dawn.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Near predicted monthly values over the UT day.

PCA Event : 10MeV Proton/PCA Event Began at 1800UT 23/04, Ended at 1900UT 23/04

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


2. FORECAST (24 APRIL - 26 APRIL)
Date   T index  Conditions       MUFs                              
24 Apr    80    Fair             Depressed 15%/near predicted 
                                 monthly values
25 Apr    95    Normal           Near predicted monthly values    
26 Apr   110    Normal           Near to 15% above 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 23-Apr in the Australian region were enhanced 
by 15-20%. MUF depressions have been observed in southern Australian 
regions after local dawn due to recent increased geomagnetic 
activity. Sporadic-E was observed at Learmonth. Spread F was 
observed at Hobart and Perth during local night hours. MUFs are 
expected to be near predicted monthly values to 15% depressed 
on 24-Apr. MUFs are expected to be near predicted monthly values 
to 15% enhanced over 25-26 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