[Ips-dhfpr] ASWFC Daily HF Prop Report - 19 April 24 issued 2330 UT on 19 Apr 2024 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/19 APRIL 2024
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (19 APRIL) 
Date   T index  Conditions    
19 Apr   132    Normal-fair    

Flares    Max     Fadeout    Freq.  Sectors
  M2.1    0453UT  possible   lower  E. Asia/Aust.
  M1.0    1307UT  possible   lower  European

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

PCA Event : No event.

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


2. FORECAST (20 APRIL - 22 APRIL)
Date   T index  Conditions       MUFs                              
20 Apr   125    Fair             Near predicted monthly values 
                                 to 30% depressed
21 Apr   120    Normal-fair      Near predicted monthly values 
                                 to 30% depressed    
22 Apr   130    Normal           Near predicted monthly values   

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 southern Australian 
region on UT day 19-Apr were near predicted values to 25% depressed, 
particularly near local dawn hours. MUFs in the northern Australian 
region were near predicted values to 25% enhanced. Spread-F was 
observed in Perth and Niue during local dawn hours, and in Hobart 
during local night and dawn hours. Ionospheric scintillation 
was observed at Niue between 19/1756-1038 UT. MUFs are expected 
to be near predicted monthly values in the northern Australian 
region over 20-22 Apr. 

MUFs are expected to be near predicted 
monthly values to 30% depressed in the southern Australian region 
over 20-21 Apr, returning to mostly near predicted monthly values 
by 22-Apr. Shortwave fadeouts are probable.

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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