[Ips-dhfpr] SWS Daily HF Prop Report - 15 January 22 issued 2331 UT on 15 Jan 2022

[Regional Warning Centre]

SUBJ: SWS DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/15 JANUARY 2022 BY Space Weather Services
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (15 JANUARY) 
Date   T index  Conditions    
15 Jan     9    Fair           

Flares: none.

MUFs:
   Cocos Island Region:
      Depressed by 30% during local day.
      Near predicted monthly values during local night.
   Niue Island Region:
      Near predicted monthly values during local day.
      Depressed by 35% during local night.
      Enhanced by 20% after local dawn.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 15% during local night.
   Southern Australian Region:
      Depressed by 25% during local day.
      Near predicted monthly values during local night.
   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
Dec      34
Jan      36
Feb      39


2. FORECAST (16 JANUARY - 18 JANUARY)
Date   T index  Conditions       MUFs                              
16 Jan    20    Fair-normal      Depressed 10 to 15%/near predicted 
                                 monthly values
17 Jan    25    Fair-normal      Depressed 10 to 15%/near predicted 
                                 monthly values    
18 Jan    35    Normal           Near predicted monthly values   

COMMENT: SWS SWF HF Communications Warning 3 was issued on 14 
January and is current for 14-16 Jan. Australian regional Maximum 
Usable Frequencies (MUFs) were variable with some sites depressed 
by up to 30% during the local day yesterday (00-08UT 15 January), 
and degraded conditions were also observed local night hours 
on regional ionograms. The ionospheric variability/depressed 
conditions were stronger than expected and followed geomagnetic 
activity induced by a coronal hole wind stream. MUFs are expected 
to be initially mildly depressed today then recovering to near 
normal as the day progresses. In general mildly depressed and 
degraded conditions are expected after local dawn, and during 
local night hours for interval 16-17 Jan, particularly for the 
southern Australian region.

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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.

Space Weather Services              email: asfc at bom.gov.au
Bureau of Meteorology
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Haymarket NSW 1240  AUSTRALIA       FTP: ftp://ftp-out.sws.bom.gov.au
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