[Ips-dhfpr] ASWFC Daily HF Prop Report - 20 February 23 issued 2331 UT on 20 Feb 2023 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/20 FEBRUARY 2023
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (20 FEBRUARY) 
Date   T index  Conditions    
20 Feb   117    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M4.4    1458UT  possible   lower  South American/
                                    Atlantic

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Enhanced by 15% during local night.
      Enhanced by 55% after local dawn.
   Niue Island Region:
      Enhanced by 15% during local day.
      Enhanced by 25% during local night.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 25% during local night.
   Southern Australian Region:
      Enhanced by 15% during local day.
      Enhanced by 20% during local night.
   Antarctic Region (Casey/Scott Base/Davis/Mawson):
      Enhanced by 20% over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Jan      119
Feb      75
Mar      76


2. FORECAST (21 FEBRUARY - 23 FEBRUARY)
Date   T index  Conditions       MUFs                              
21 Feb   115    Normal-fair      Near to 15% above predicted 
                                 monthly values
22 Feb   115    Normal           Near to 15% above predicted 
                                 monthly values    
23 Feb   115    Normal           Near to 15% above predicted 
                                 monthly values   

COMMENT: ASWFC Preliminary HF Communications Warning 19 was issued 
on 17 February and is current for 19-21 Feb. Maximum usable frequencies 
(MUFs) in the Australian region on 20-Feb were near predicted 
monthly values to 25% enhanced. MUFs are expected to be near 
predicted monthly values to 15% enhanced over 21-23 Feb, with 
mild degradations possible over 21-22 Feb due to anticipated 
geomagnetic activity. 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