[Ips-dhfpr] ASWFC Daily HF Prop Report - 17 December 24 issued 2330 UT on 17 Dec 2024 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/17 DECEMBER 2024
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (17 DECEMBER) 
Date   T index  Conditions    
17 Dec   121    Fair-normal    

Flares: none.

MUFs:
   Cocos Island Region:
      Enhanced by 20% during local day.
      Near predicted monthly values during local night.
   Niue Island Region:
      Enhanced by 25% during local day.
      Near predicted monthly values during local night.
      Depressed by 25% after local dawn.
   Northern Australian Region:
      Enhanced by 15% during local day.
      Near predicted monthly values during local night.
      Depressed by 25% after local dawn.
   Southern Australian Region:
      Mostly near predicted monthly values.
      Depressed by 40% after local dawn.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 20% over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Nov      127
Dec      117
Jan      114


2. FORECAST (18 DECEMBER - 20 DECEMBER)
Date   T index  Conditions       MUFs                              
18 Dec   120    Normal           Near predicted monthly values
19 Dec   130    Normal           Near predicted monthly values    
20 Dec   130    Normal           Near predicted monthly values   

COMMENT: Maximum usable frequencies (MUFs) in the northern Australian 
region on UT day 17-Dec were mostly near predicted monthly values 
to 15% enhanced. MUFs in the southern Australian region were 
near predicted monthly values to depressed by 40% during local 
dawn. Sporadic E was observed at multiple locations in the Australian 
region during local night. MUFs are expected to be near predicted 
monthly vales over 18-20 Dec, with mild depressions possible 
on 18-Dec due to possible ongoing geomagnetic activity. Sporadic 
E is more likely to be observed around the Australian region 
over December than at other times of the year. 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