[Ips-dhfpr] ASWFC Daily HF Prop Report - 11 December 22 issued 2331 UT on 11 Dec 2022 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/11 DECEMBER 2022
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (11 DECEMBER) 
Date   T index  Conditions    
11 Dec    86    Normal         

Flares: none.

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Enhanced by 15% during local night.
      Enhanced by 25% after local dawn.
   Niue Island Region:
      Enhanced by 25-35%.
   Northern Australian Region:
      Mostly near predicted monthly values.
   Southern Australian Region:
      Mostly near predicted monthly values.
   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 (12 DECEMBER - 14 DECEMBER)
Date   T index  Conditions       MUFs                              
12 Dec    75    Normal           Near predicted monthly values
13 Dec    75    Normal           Near predicted monthly values    
14 Dec    75    Normal           Near predicted monthly values   

COMMENT: ASWFC SWF HF Communications Warning 99 was issued on 
9 December and is current for 10-12 Dec. Maximum usable frequencies 
(MUFs) in the Australian region on UT day 11-Dec were near predicted 
monthly values, with enhancements 15 to 35% observed at the low 
latitudes sites of Cocos Island and Niue. Mild depressions of 
15% were observed early in the UT day for some southern region 
sites. Mild spread F briefly observed over night at Hobart. Frequent 
ionospheric sporadic E layer observed at middle latitude sites. 
MUFs are expected to be generally near predicted monthly values, 
with brief mild depressions after local dawn for the southern 
Australian region which are not expected to persist. Isolated 
minor 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