[Ips-dhfpr] ASWFC Daily HF Prop Report - 21 January 24 issued 2331 UT on 21 Jan 2024 [SEC=OFFICIAL]

[Regional Warning Centre]

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

1. SUMMARY (21 JANUARY) 
Date   T index  Conditions    
21 Jan   153    Normal         

Flares: none.

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Enhanced by 35% during local night.
      Enhanced by 30% after local dawn.
   Niue Island Region:
      Near predicted monthly values.
   Northern Australian Region:
      Enhanced by 20% during local day.
      Enhanced by 35% during local night.
   Southern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 20% during local night.
   Antarctic Region (Casey/Davis/Mawson):
      Enhanced by 15% over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Dec      110
Jan      106
Feb      105


2. FORECAST (22 JANUARY - 24 JANUARY)
Date   T index  Conditions       MUFs                              
22 Jan   150    Fair             Near to 15% above predicted 
                                 monthly values
23 Jan   100    Fair             Near predicted monthly values/depressed 
                                 0 to 15%    
24 Jan   100    Normal-fair      Near predicted monthly values/depressed 
                                 0 to 15%   

COMMENT: ASWFC Preliminary HF Communications Warning 5 was issued 
on 20 January and is current for 23 Jan only. Maximum usable 
frequencies (MUFs) on UT day 21-Jan were enhanced by up to 35% 
in the northern Australian region and were near predicted monthly 
values to 20% enhanced in the southern Australian region, in 
both cases the strongest enhancements were observed during local 
night. Sporadic E obscured the F-layer at Brisbane, Canberra, 
Hobart and Norfolk Island at times during the UT day and less 
significant sporadic E was present for most of the remainder 
of the day. MUFs are expected to be near predicted monthly values 
to 15% enhanced on 22-Jan. MUFs are expected to be near monthly 
predicted values on 23-24 Jan, with the possibility of depressions 
in the southern Australian region due to anticipated geomagnetic 
activity on 22-23 Jan. Brief periods of sporadic E are expected 
to persist over 22-24 Jan.

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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