[Ips-dhfpr] ASWFC Daily HF Prop Report - 28 February 23 issued 2331 UT on 28 Feb 2023 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/28 FEBRUARY 2023
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (28 FEBRUARY) 
Date   T index  Conditions    
28 Feb    69    Poor-fair      

Flares    Max     Fadeout    Freq.  Sectors
  M8.6    1750UT  probable   lower  South American/
                                    Atlantic

MUFs:
   Cocos Island Region:
      Mostly near predicted monthly values.
      Enhanced by 45% after local dawn.
   Niue Island Region:
      Enhanced by 25% during local day.
      Enhanced by 45% during local night.
   Northern Australian Region:
      Near predicted monthly values.
   Southern Australian Region:
      Depressed by 35% during local day.
      Depressed by 15% 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
Jan      119
Feb      75
Mar      76


2. FORECAST (01 MARCH - 03 MARCH)
Date   T index  Conditions       MUFs                              
01 Mar    75    Normal           Near predicted monthly values
02 Mar    90    Normal           Near predicted monthly values    
03 Mar    90    Normal           Near predicted monthly values   

COMMENT: Maximum usable frequencies (MUFs) in the Northern Australian 
region on UT day 27-Feb were near monthly predicted values. MUFs 
in the southern Australian region were depressed by up to 35%, 
depressions of up to 35% were also observed at Learmonth during 
local day. The depressed HF conditions are due to ongoing geomagnetic 
activity due to a combination of coronal hole high speed wind 
stream effects and two CME impacts on 26-Feb and 27-Feb. Significant 
sporadic-E was observed at Hobart, Norfolk Island, Brisbane and 
Townsville, mostly during local night. Spread F was observed 
at Hobart and Perth during local night. MUFs are expected to 
recover to near predicted monthly values, with some mild depressions 
possible at high latitudes on 1-Mar as geomagnetic activity wanes. 
MUFs are expected to be near monthly predicted values over 2-3 
Mar. 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