[Ips-dhfpr] ASWFC Daily HF Prop Report - 21 April 24 issued 2330 UT on 21 Apr 2024 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/21 APRIL 2024
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (21 APRIL) 
Date   T index  Conditions    
21 Apr   138    Normal-fair    

Flares    Max     Fadeout    Freq.  Sectors
  M1.0    1259UT  possible   lower  European
  M2.2    1514UT  possible   lower  South American/
                                    Atlantic
  M3.4    2152UT  possible   lower  East Pacific/
                                    North American

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

PCA Event : No event.

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


2. FORECAST (22 APRIL - 24 APRIL)
Date   T index  Conditions       MUFs                              
22 Apr   135    Normal           Near predicted monthly values
23 Apr   135    Normal           Near predicted monthly values    
24 Apr   135    Normal           Near predicted monthly values   

COMMENT: ASWFC SWF HF Communications Warning 40 was issued on 
21 April and is current for 22-24 Apr. Maximum usable frequencies 
(MUFs) in the northern Australian region on UT day 21-Apr were 
near predicted monthly values, with 25% enhancement observed 
after local dawn. MUFs in the southern Australian region were 
near predicted monthly values. Spread-F was observed in Hobart 
during local night hours. Periods of sporadic-E were observed 
in Brisbane and Perth. MUFs in the Australian region are expected 
to be near predicted monthly values over 22-24 Apr with some 
mild depressions possible due to geomagnetic activity. 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