[Ips-dhfpr] ASWFC Daily HF Prop Report - 24 January 25 issued 2330 UT on 24 Jan 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/24 JANUARY 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (24 JANUARY) 
Date   T index  Conditions    
24 Jan   111    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M2.7    2104UT  possible   lower  East Pacific/
                                    North American

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Enhanced by 55% during local night.
   Niue Island Region:
      Near predicted monthly values.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian Region:
      Depressed by 20% during local day.
      Near predicted monthly values during local night.
   Antarctic Region (Casey/Davis/Mawson):
      Near predicted monthly values over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Dec      132
Jan      119
Feb      116


2. FORECAST (25 JANUARY - 27 JANUARY)
Date   T index  Conditions       MUFs                              
25 Jan   100    Fair             Near predicted monthly values/depressed 
                                 10 to 15%
26 Jan    80    Fair-normal      Depressed 10 to 20%/near predicted 
                                 monthly values    
27 Jan   100    Normal           Near predicted monthly values   

COMMENT: ASWFC Preliminary HF Communications Warning 12 was issued 
on 23 January and is current for 24-26 Jan. Maximum usable frequencies 
(MUFs) in the Australian region on UT day 24-Jan were near predicted 
monthly values to 20% enhanced for the northern Australian region 
and depressed 15-20% for the southern Australian region. Spread 
F and sporadic E was observed during local night hours at Hobart. 
MUFs are expected to be near predicted monthly values for most 
of the UT day 25-Jan and 10-20% depressed on 26-Jan, due to an 
anticipated CME arrival on 25-Jan. The CME arrival expected on 
24-Jan did not eventuate. Isolated minor 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