[Ips-dhfpr] ASWFC Daily HF Prop Report - 05 December 23 issued 0649 UT on 06 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
+++ Reissued for correction of ionospheric 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           Near predicted monthly values    
08 Dec   120    Normal           Near predicted monthly values  

COMMENT: ASWFC SWF HF Communications Warning 125 was issued on 
5 December and is current for 6-8 Dec. ASWFC Preliminary HF Communications 
Warning 126 was issued on 5 December and is current for 7-8 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. MUFs are expected to be
near predicted monthly values on 07-08 Dec. 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