[Ips-dhfpr] ASWFC Daily HF Prop Report - 10 December 23 issued 2330 UT on 10 Dec 2023 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/10 DECEMBER 2023
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (10 DECEMBER) 
Date   T index  Conditions    
10 Dec   112    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M2.3    0353UT  possible   lower  E. Asia/Aust.
  M1.4    2243UT  possible   lower  East Pacific/
                                    North American

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Enhanced by 25% 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 during local day.
      Enhanced by 15% 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      114
Dec      100
Jan      98


2. FORECAST (11 DECEMBER - 13 DECEMBER)
Date   T index  Conditions       MUFs                              
11 Dec   100    Normal-fair      Near predicted monthly values
12 Dec   100    Fair-normal      Near predicted monthly values    
13 Dec   100    Normal           Near predicted monthly values   

COMMENT: ASWFC SWF HF Communications Warning 128 was issued on 
9 December and is current for 9-11 Dec. Maximum usable frequencies 
(MUFs) were near predicted monthly values to 15% enhanced in 
the Australian region on UT day 10-Dec. Sporadic E was frequently 
observed during the UT day at Learmonth and Perth. Spread F observed 
overnight at Hobart. MUFs are expected to be near predicted monthly 
values over 11-13 Dec. Mild depressions of 10-15% may be experienced 
briefly after local dawn on 12-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