[Ips-dhfpr] ASWFC Daily HF Prop Report - 20 January 25 issued 2330 UT on 20 Jan 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/20 JANUARY 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (20 JANUARY) 
Date   T index  Conditions    
20 Jan    96    Fair-normal    

Flares: none.

MUFs:
   Cocos Island Region:
      Depressed by 20-35%.
   Niue Island Region:
      Enhanced by 15% during local day.
      Near predicted monthly values during local night.
   Northern Australian Region:
      Depressed by 20% during local day.
      Near predicted monthly values during local night.
   Southern Australian Region:
      Depressed by 15% during local day.
      Near predicted monthly values during local night.
      Hobart and Canberra 15-20% depressed after dawn.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 25% over the UT day.

PCA Event : No event.

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


2. FORECAST (21 JANUARY - 23 JANUARY)
Date   T index  Conditions       MUFs                              
21 Jan   105    Fair-normal      Depressed 10 to 15%/near predicted 
                                 monthly values
22 Jan   105    Fair-normal      Depressed 10 to 15%/near predicted 
                                 monthly values    
23 Jan   120    Normal           Near predicted monthly values   

COMMENT: Maximum usable frequencies (MUFs) in the Australian 
region on UT day 20-Jan were depressed 15-20% during the local 
day. Sporadic-E was observed in Hobart and Niue, and spread F 
was observed at Hobart overnight. Ionospheric scintillation was 
observed during the interval 20/1324-1610UT at Darwin and Weipa. 
MUFs are expected to be 15% depressed to near predicted monthly 
on 21-22 Jan, then near predicted monthly values for 23 Jan. 
Isolated minor fadeouts 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