[Ips-dhfpr] ASWFC Daily HF Prop Report - 27 December 22 issued 2331 UT on 27 Dec 2022 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/27 DECEMBER 2022
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (27 DECEMBER) 
Date   T index  Conditions    
27 Dec   128    Fair-Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M2.1    0054UT  possible   lower  West Pacific
  M1.1    0815UT  possible   lower  Mid East/Indian
  M1.2    1626UT  possible   lower  South American/
                                    Atlantic

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Enhanced by 35% during local night.
   Niue Island Region:
      Near predicted monthly values during local day.
      Enhanced by 50% during local night.
   Northern Australian Region:
      Enhanced by 15-50%.
   Southern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 15% during local night.
      Depressed 15% after local dawn.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Depressed by 20% over the UT day.

PCA Event : No event.

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


2. FORECAST (28 DECEMBER - 30 DECEMBER)
Date   T index  Conditions       MUFs                              
28 Dec    65    Fair-normal      Depressed 10 to 15%/near predicted 
                                 monthly values
29 Dec    70    Normal           Near predicted monthly values    
30 Dec    70    Normal           Near predicted monthly values   

COMMENT: ASWFC SWF HF Communications Warning 105 was issued on 
27 December and is current for 27-29 Dec. Maximum usable frequencies 
(MUFs) in the Australian region on UT day 27-Dec were mostly 
enhanced by up to 50% as the regional ionosphere had an unexpected 
positive response to the previous nights mild geomagnetic activity. 
Spread F was observed at Hobart over night. Sporadic E was observed 
at several middle latitude sites. The Australian ionosphere has 
been variable after local dawn, 15% depressed in the southern 
region and near normal to 15% enhanced in the northern region. 
MUFs are generally expected to be near predicted monthly values 
on 28-Dec, with depressions of 15% for southern Australian region 
early today then recovering. Isolated minor fadeouts 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