[Ips-dhfpr] ASWFC Daily HF Prop Report - 25 December 22 issued 2330 UT on 25 Dec 2022 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/25 DECEMBER 2022
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (25 DECEMBER) 
Date   T index  Conditions    
25 Dec    59    Normal-fair    

Flares: none.

MUFs:
   Cocos Island Region:
      Mostly near predicted monthly values.
   Niue Island Region:
      Enhanced by 30% during local day.
      Enhanced by 35% during local night.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian Region:
      Depressed by 15% during local day.
      Near predicted monthly values during local night.
   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 (26 DECEMBER - 28 DECEMBER)
Date   T index  Conditions       MUFs                              
26 Dec    70    Normal-fair      Near predicted monthly values
27 Dec    55    Normal-fair      Near predicted monthly values 
                                 to 20% depressed    
28 Dec    60    Normal-fair      Near predicted monthly values 
                                 to 20% depressed   

COMMENT: ASWFC SWF HF Communications Warning 103 was issued on 
25 December and is current for 25-26 Dec. Maximum usable frequencies 
(MUFs) in the Australian region on UT day 25-Dec were mostly 
near predicted monthly values, with some depressions of 15% observed 
during the local day in the southern regions. Strong sporadic-E 
was observed at most sites over the UT day and night. MUFs are 
expected to be near predicted monthly values on 26-Dec, then 
becoming up to 20% depressed over 27-28 Dec to follow anticipated 
geomagnetic activity. Sporadic-E is expected to continue over 
26-28 Dec. Isolated shortwave fadeouts are 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