[Ips-dhfpr] ASWFC Daily HF Prop Report - 17 November 23 issued 2331 UT on 17 Nov 2023 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/17 NOVEMBER 2023
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (17 NOVEMBER) 
Date   T index  Conditions    
17 Nov    95    Normal         

Flares: none.

MUFs:
   Cocos Island Region:
      Near predicted monthly values.
   Niue Island Region:
      Mostly near predicted monthly values.
   Northern Australian Region:
      Mostly near predicted monthly values.
      Depressed by 20% after local dawn.
   Southern Australian Region:
      Depressed by 20% 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
Oct      130
Nov      100
Dec      98


2. FORECAST (18 NOVEMBER - 20 NOVEMBER)
Date   T index  Conditions       MUFs                              
18 Nov    95    Normal           Near predicted monthly values 
                                 to 15% depressed
19 Nov    90    Normal           Near predicted monthly values 
                                 to 15% depressed    
20 Nov    80    Normal-fair      Near predicted monthly values 
                                 to 20-30% depressed.   

COMMENT: Maximum usable frequencies (MUFs) in the Australian 
region were mostly near predicted values, although there were 
depressions observed after local dawn hours and also during daylight 
hours for the southern Australian region. Sporadic-E was observed 
at Brisbane, Cocos Islands and Norfolk Island during local night 
hours, with Brisbane being heavily affected. The reason behind 
the depressions may be due to the lack of sunspots on the visible 
disk at the moment, but this is not expected to continue significantly. 
MUFs are expected to be near predicted values to 15% depressed 
over 18-20 Nov during local dawn hours. Further depressions up 
to 20-30% are possible from 20-Nov due to expected geomagnetic 
activity.

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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