[Ips-dhfpr] ASWFC Daily HF Prop Report - 31 December 24 issued 2330 UT on 31 Dec 2024 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/31 DECEMBER 2024
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (31 DECEMBER) 
Date   T index  Conditions    
31 Dec   136    Normal-fair    

Flares    Max     Fadeout    Freq.  Sectors
  M1.0 30/2241UT  possible   lower  East Pacific/
                                    North American
  M1.0    0500UT  possible   lower  E. Asia/Aust.
  M2.0    2151UT  possible   lower  East Pacific/
                                    North American
  M2.7    2219UT  possible   lower  East Pacific/
                                    North American

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

PCA Event : No event.

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


2. FORECAST (01 JANUARY - 03 JANUARY)
Date   T index  Conditions       MUFs                              
01 Jan   125    Fair             Near predicted monthly values
02 Jan   125    Fair-normal      Near predicted monthly values    
03 Jan   145    Normal           Near to 15% above predicted 
                                 monthly values   

COMMENT: ASWFC Preliminary HF Communications Warning 150 was 
issued on 29 December and is current for 31 Dec to 2 Jan. ASWFC 
SWF HF Communications Warning 151 was issued on 31 December and 
is current for 31 Dec to 2 Jan. Maximum usable frequencies (MUFs) 
in the Australian region on UT day 31-Dec were near predicted 
monthly values with depressions of up to 25% observed in the 
northern Australian region after local dawn. Sporadic-E at low 
frequencies was common at most sites at various hours. MUFs are 
expected to be near predicted monthly values to 15% depressed 
over 01-02 Jan, due to anticipated geomagnetic activity. MUFs 
are expected to be near predicted monthly values on 03-Jan. 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