[Ips-dhfpr] ASWFC Daily HF Prop Report - 19 December 24 issued 2330 UT on 19 Dec 2024 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/19 DECEMBER 2024
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (19 DECEMBER) 
Date   T index  Conditions    
19 Dec   111    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M1.6    1038UT  possible   lower  European
  M3.8    1534UT  possible   lower  South American/
                                    Atlantic
  M1.7    1900UT  possible   lower  East Pacific/
                                    North American

MUFs:
   Cocos Island Region:
      Depressed by 35% during local day.
      Depressed by 25% during local night.
   Niue Island Region:
      Enhanced by 15% during local day.
      Near predicted monthly values during local night.
   Northern Australian Region:
      Mostly near predicted monthly values.
   Southern Australian Region:
      Mostly near predicted monthly values.
   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 (20 DECEMBER - 22 DECEMBER)
Date   T index  Conditions       MUFs                              
20 Dec   110    Normal           Near predicted monthly values 
                                 to 15% enhanced
21 Dec   115    Normal           Near predicted monthly values 
                                 to 20% enhanced    
22 Dec   120    Normal           Near predicted monthly values 
                                 to 20% enhanced   

COMMENT: ASWFC SWF HF Communications Warning 145 was issued on 
18 December and is current for 18-20 Dec. Maximum usable frequencies 
(MUFs) in the Australian region on UT day 19-Dec were mostly 
near predicted monthly values. Sporadic-E was common at most 
sites during local night hours. Darwin and Learmonth were degradeed 
during local daylight and night hours. MUFs are expected to be 
near predicted values and up to 15-20% enhanced over 20-22 Dec.

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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