[Ips-dhfpr] ASWFC Daily HF Prop Report - 22 October 22 issued 2331 UT on 22 Oct 2022 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/22 OCTOBER 2022
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (22 OCTOBER) 
Date   T index  Conditions    
22 Oct    69    Normal-fair    

Flares: none.

MUFs:
   Cocos Island Region:
      Near predicted monthly values.
   Niue Island Region:
      Mostly near predicted monthly values.
      Depressed by 25% after local dawn.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 15% during local night.
   Southern Australian Region:
      Mostly near predicted monthly values.
      Depressed by 35% after local dawn.
   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
Sep      74
Oct      69
Nov      69


2. FORECAST (23 OCTOBER - 25 OCTOBER)
Date   T index  Conditions       MUFs                              
23 Oct    55    Normal           Near predicted monthly values 
                                 northern Aus. region
23 Oct   -10    Fair             Depressed 20 to 30% southern Aus. region
24 Oct    65    Fair-normal      Depressed 10 to 15%/near predicted 
                                 monthly values    
25 Oct    75    Normal           Near predicted monthly values   

COMMENT: ASWFC HF Communications Warning 81 was issued on 22 
October and is current for 23 Oct only. Maximum usable frequencies 
(MUFs) on UT day 22-Oct were near predicted monthly values for 
most of the UT day. Following unexpected overnight geomagnetic 
activity southern Australian region MUFs are currently depressed 
by up to 30% after local dawn this morning. Northern Australian 
region MUFs are currently near predicted monthly values. Spread 
F was observed during local night hours at Hobart. Depressed 
and degraded conditions are now expected for southern Australian 
region for 23-Oct. Northern Australian region MUFs are expected 
to remain near normal. Further degraded HF conditions for the 
southern Australian region are possible if coronal hole wind 
stream induced geomagnetic activity eventuates over 23-24-Oct.

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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