[Ips-dhfpr] ASWFC Daily HF Prop Report - 07 December 22 issued 2331 UT on 07 Dec 2022 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/07 DECEMBER 2022
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (07 DECEMBER) 
Date   T index  Conditions    
07 Dec   101    Normal-fair    

Flares: none.

MUFs:
   Cocos Island Region:
      Enhanced by 15% during local day.
      Enhanced by 65% during local night.
   Niue Island Region:
      Near predicted monthly values.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 20% during local night.
      Enhanced by 15-20% after local dawn.
   Southern Australian Region:
      Mostly near predicted monthly values.
      Depressed 20% to enhanced by 25% after local dawn.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Near predicted monthly values over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Nov      77
Dec      70
Jan      70


2. FORECAST (08 DECEMBER - 10 DECEMBER)
Date   T index  Conditions       MUFs                              
08 Dec    70    Normal-fair      Depressed 10 to 15%/near predicted 
                                 monthly values
09 Dec    70    Normal-fair      Depressed 10 to 15%/near predicted 
                                 monthly values    
10 Dec    70    Normal           Near predicted monthly values   

COMMENT: ASWFC Preliminary HF Communications Warning 97 was issued 
on 6 December and is current for 7-9 Dec. Maximum usable frequencies 
(MUFs) in the Australian region on UT day 07-Dec were generally 
near predicted monthly values to 25% enhanced, with strong enhancements 
observed at Cocos Island. MUFs have been quite variable after 
local dawn this morning with some sites 20% enhanced whilst others 
15% depressed. The regional ionosphere appears to have shown 
an unexpected positive response to the onset of mild geomagnetic 
activity associated with the Earth's entry into a coronal hole 
wind stream. Spread F was observed at Hobart during local night 
hours. Occasional blanketing sporadic E was observed at some 
sites. The ionosphere at Darwin and Townsville appeared briefly 
disturbed after local dawn this morning. MUFs are expected to 
be generally near predicted monthly values with depressions of 
15% possible over 08-09 Dec for the southern Australian region 
due to a mild increase in geomagnetic activity expected during 
this period.

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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