[Ips-dhfpr] ASWFC Daily HF Prop Report - 12 September 23 issued 2330 UT on 12 Sep 2023 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/12 SEPTEMBER 2023
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (12 SEPTEMBER) 
Date   T index  Conditions    
12 Sep   116    Normal-fair    

Flares    Max     Fadeout    Freq.  Sectors
  M1.9    0426UT  possible   lower  E. Asia/Aust.
  M2.5    0707UT  possible   lower  Mid East/Indian

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Enhanced by 45% during local night.
   Niue Island Region:
      Mostly near predicted monthly values.
      Enhanced by 20% after local dawn.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 20% during local night.
   Southern Australian Region:
      Mostly near predicted monthly values.
      Depressed 15% after local dawn.
   Antarctic Region (Casey/Davis/Mawson):
      Enhanced by 15% over the UT day.

PCA Event : No event.

Monthly T index:
Month  T index
Aug      115
Sep      96
Oct      93


2. FORECAST (13 SEPTEMBER - 15 SEPTEMBER)
Date   T index  Conditions       MUFs                              
13 Sep    80    Fair-normal      Depressed 15 to 20%/near predicted 
                                 monthly values
14 Sep   110    Normal           Near predicted monthly values    
15 Sep   110    Normal           Near predicted monthly values   

COMMENT: ASWFC SWF HF Communications Warning 89 was issued on 
11 September and is current for 11-13 Sep. Maximum usable frequencies 
(MUFs) on UT day 12-Sep were generally near predicted monthly 
values to 20% enhanced in the Australian region. HF conditions 
became mildly degraded overnight in the southern Australian region 
with spread F was observed at Hobart during local night hours. 
Depressions of 15% have been observed after local dawn this morning 
for the southern Australian region. Depressed conditions may 
persist into early in the UT day on 13-Sep, then MUFs are expected 
to recover as brief overnight geomagnetic activity has abated. 
Very minor fadeouts may have been experienced at 12/0426UT and 
12/0707UT in association with R1 flare activity. MUFs are generally 
expected to be near predicted monthly values over 13-15 Sep. 
Isolated minor 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