[Ips-dhfpr] ASWFC Daily HF Prop Report - 20 April 24 issued 2330 UT on 20 Apr 2024 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/20 APRIL 2024
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (20 APRIL) 
Date   T index  Conditions    
20 Apr   130    Fair           

Flares: none.

MUFs:
   Cocos Island Region:
      Enhanced by 15% during local day.
      Enhanced by 70% during local night.
      Enhanced by 75% after local dawn.
   Niue Island Region:
      Mostly near predicted monthly values.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 15% during local night.
   Southern Australian Region:
      Depressed by 30% during local day.
      Near predicted monthly values during local night.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 15% over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Mar      120
Apr      114
May      115


2. FORECAST (21 APRIL - 23 APRIL)
Date   T index  Conditions       MUFs                              
21 Apr   130    Normal-fair      Near predicted monthly values 
                                 to 15-20% depressed
22 Apr   135    Normal           Near predicted monthly values 
                                 to 20% enhanced in the northern 
                                 Australian region    
23 Apr   135    Normal           Near predicted monthly values 
                                 to 20% enhanced in the northern 
                                 Australian region   

COMMENT: ASWFC HF Communications Warning 38 was issued on 19 
April and is current for 19-21 Apr. ASWFC SWF HF Communications 
Warning 39 was issued on 19 April and is current for 20-22 Apr. 
Maximum usable frequencies (MUFs) in the northern Australian 
region on UT day 20-Apr were near predicted values to 15% enhanced. 
MUFs in the southern Australian region were near predicted monthly 
values to 30% depressed. Spread-F was observed in Canberra and 
Hobart during local night hours. Ionospheric scintillation was 
observed near Weipa from 20/1243-1259 UT.

 MUFs are expected to be near predicted monthly values to 20% enhanced
 in the northern Australian region over 21-23 Apr. MUFs in the southern 
Australian region are expected to be mostly near predicted monthly values 
over 21-23 Apr, with some depressions of 15-20% possible during 
local night and dawn hours on 21-Apr. 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