[Ips-dhfpr] ASWFC Daily HF Prop Report - 22 December 23 issued 2331 UT on 22 Dec 2023 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/22 DECEMBER 2023
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (22 DECEMBER) 
Date   T index  Conditions    
22 Dec   118    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M3.3    0004UT  possible   lower  West Pacific

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Enhanced by 30% during local night.
      Enhanced by 25% after local dawn.
   Niue Island Region:
      Near predicted monthly values.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 15% during local night.
   Southern Australian Region:
      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      114
Dec      100
Jan      98


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

COMMENT: ASWFC SWF HF Communications Warning 132 was issued on 
21 December and is current for 21-23 Dec. Maximum usable frequencies 
(MUFs) on UT day 22-Dec in the Australian region were near predicted 
monthly values, with enhancements of up to 15% visible in the 
northern Australian region during local night. Spread F was observed 
at Hobart during local night. Sporadic E was observed at Brisbane 
and Canberra at the end of the UT day. MUFs are generally expected 
to be 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