[Ips-dhfpr] ASWFC Daily HF Prop Report - 31 December 23 issued 2330 UT on 31 Dec 2023 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/31 DECEMBER 2023
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (31 DECEMBER) 
Date   T index  Conditions    
31 Dec   135    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M1.0    1913UT  possible   lower  East Pacific/
                                    North American
  X5.0    2155UT  probable   all    East Pacific/
                                    North American

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Enhanced by 20% during local night.
   Niue Island Region:
      Near predicted monthly values during local day.
      Enhanced by 25% during local night.
   Northern Australian Region:
      Enhanced by 15% during local day.
      Enhanced by 15% during local night.
   Southern Australian Region:
      Enhanced by 15% 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
Nov      114
Dec      100
Jan      98


2. FORECAST (01 JANUARY - 03 JANUARY)
Date   T index  Conditions       MUFs                              
01 Jan   130    Normal           Near to 15% above predicted 
                                 monthly values
02 Jan   130    Normal           Near to 15% above predicted 
                                 monthly values    
03 Jan   130    Normal           Near to 15% above predicted 
                                 monthly values   

COMMENT: ASWFC SWF HF Communications Warning 134 was issued on 
31 December and is current for 1-3 Jan. Maximum usable frequencies 
(MUFs) on UT day 31-Dec in the Australian region were near predicted 
monthly values to 15% enhanced. A shortwave fadeout was experienced 
throughout much of the Australian region due to the X5.0 flare 
at 31/2155UT. MUFs are expected to be near predicted monthly 
values to 15% enhanced over 01-03 Jan. Shortwave fadeouts are 
probable.

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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