[Ips-dhfpr] SWS Daily HF Prop Report - 21 September 19 issued 2334 UT on 21 Sep 2019

[rwc]

SUBJ: SWS DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/21 SEPTEMBER 2019 BY Space Weather Services
FROM THE AUSTRALIAN SPACE FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (21 SEPTEMBER) 
Date   T index  Conditions    
21 Sep    -4    Normal         

Flares: none.

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

PCA Event : No event.

Monthly T index:
Month  T index
Aug      -3
Sep      -14
Oct      -16


2. FORECAST (22 SEPTEMBER - 24 SEPTEMBER)
Date   T index  Conditions       MUFs                              
22 Sep    -2    Normal           Near predicted monthly values
23 Sep    -4    Normal-fair      Near predicted monthly values/depressed 
                                 10 to 20%    
24 Sep    -5    Normal-fair      Near predicted monthly values/depressed 
                                 10 to 20%   

COMMENT: Maximum usable frequencies (MUFs) in the Australian 
region were mostly near predicted monthly values during UT day 
21 September. Some periods of minor to moderate MUF enhancements 
as well as MUF depressions were also observed. Sporadic-E and 
Spread-F occurrences were observed over some sites. For the next 
three UT days, 22-24 September, MUFs are expected to be near 
predicted monthly values with the possibility of minor to moderate 
MUF depressions on UT days 23 and 24 September.

----------------------------------------------------------
For an explanation of some of the terms in this report, go to
http://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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