[Ips-dhfpr] ASWFC Daily HF Prop Report - 05 December 23 issued 2344 UT on 05 Dec 2023 [SEC=OFFICIAL]

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SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/05 DECEMBER 2023
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (05 DECEMBER) 
Date   T index  Conditions    
05 Dec   107    Fair-normal    

Flares    Max     Fadeout    Freq.  Sectors
  M1.5    0644UT  possible   lower  Mid East/Indian
  M1.0    2110UT  possible   lower  East Pacific/
                                    North American
  M1.4    2120UT  possible   lower  East Pacific/
                                    North American

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

PCA Event : No event.

Monthly T index:
Month  T index
Nov      114
Dec      100
Jan      98


2. FORECAST (06 DECEMBER - 08 DECEMBER)
Date   T index  Conditions       MUFs                              
06 Dec    90    Normal           Depressed 10 to 15%/near predicted 
                                 monthly values
07 Dec   120    Normal-poor      Near predicted monthly values    
08 Dec    40    Poor-fair        Depressed 15 to 30%/near predicted 
                                 monthly values   

COMMENT: ASWFC SWF HF Communications Warning 125 was issued on 
5 December and is current for 6-8 Dec. Maximum usable frequencies 
(MUFs) were mostly near predicted monthly values in the Australian 
region on UT day 05-Dec. Southern Australian region MUFs were 
depressed 20% after local dawn this morning. Sporadic E was observed 
overnight at Brisbane, Hobart and Cocos Island. MUFs are expected 
to be initially depressed 15-20% for southern Australian region 
then recovering, with northern Australian region MUFs remaining 
near normal. Degraded conditions are expected from late 07-08 
Dec due to anticipated geomagnetic storm activity. Isolated minor 
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