[Ips-dhfpr] ASWFC Daily HF Prop Report - 22 December 24 issued 2330 UT on 22 Dec 2024 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/22 DECEMBER 2024
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (22 DECEMBER) 
Date   T index  Conditions    
22 Dec   101    Normal-fair    

Flares    Max     Fadeout    Freq.  Sectors
  M1.0    0410UT  possible   lower  E. Asia/Aust.
  M1.1    1414UT  possible   lower  South American/
                                    Atlantic
  M1.1    2049UT  possible   lower  East Pacific/
                                    North American

MUFs:
   Cocos Island Region:
      Mostly near predicted monthly values.
      Depressed by 20% after local dawn.
   Niue Island Region:
      Mostly near predicted monthly values.
   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/Davis/Mawson):
      Near predicted monthly values over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Nov      127
Dec      117
Jan      114


2. FORECAST (23 DECEMBER - 25 DECEMBER)
Date   T index  Conditions       MUFs                              
23 Dec   110    Normal-fair      Near predicted monthly values
24 Dec   100    Normal-fair      Near predicted monthly values    
25 Dec   110    Normal-fair      Near predicted monthly values   

COMMENT: ASWFC SWF HF Communications Warning 147 was issued on 
21 December and is current for 21-23 Dec. Maximum usable frequencies 
(MUFs) in the Australian region on UT day 22-Dec were mostly 
near predicted monthly values, with depressions of up to 15% 
observed in the southern Australian region during local day. 
Mild spread F was observed at Hobart during local day. Sporadic 
E was observed at Hobart during local dawn and at Brisbane and 
Perth spread throughout the day. MUFs are expected to be mostly 
near predicted monthly values over 23-25 Dec. 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