[Ips-dhfpr] ASWFC Daily HF Prop Report - 02 September 23 issued 2333 UT on 02 Sep 2023 [SEC=OFFICIAL]

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SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/02 SEPTEMBER 2023
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (02 SEPTEMBER) 
Date   T index  Conditions    
02 Sep   109    Normal-fair    

Flares    Max     Fadeout    Freq.  Sectors
  M3.3    0713UT  possible   lower  Mid East/Indian

MUFs:
   Cocos Island Region:
      Enhanced by 30% during local day.
      Near predicted monthly values during local night.
   Niue Island Region:
      Enhanced by 15% during local day.
      Near predicted monthly values during local night.
      Enhanced by 35% after local dawn.
   Northern Australian Region:
      Near predicted monthly values during local day.
      Enhanced by 20% during local night.
      Enhanced 15% after local dawn.
   Southern Australian Region:
      Enhanced by 15% during local day.
      Depressed 15-20% after local dawn.
   Antarctic Region (Casey/Davis/Mawson):
      Near predicted monthly values over the UT day,
      with spread F observed,

PCA Event : 10MeV Proton/PCA Event Began at 0425UT 01/09, Ended at 2000UT 01/09

Monthly T index:
Month  T index
Aug      115
Sep      84
Oct      81


2. FORECAST (03 SEPTEMBER - 05 SEPTEMBER)
Date   T index  Conditions       MUFs                              
03 Sep    60    Fair             Depressed 15 to 20%/near predicted 
                                 monthly values
04 Sep    70    Normal-fair      Depressed 10 to 15%/near predicted 
                                 monthly values    
05 Sep    95    Normal           Near predicted monthly values   

COMMENT: ASWFC SWF HF Communications Warning 85 was issued on 
1 September and is current for 1-3 Sep. ASWFC HF Communications 
Warning 86 was issued on 2 September and is current for 3 Sep 
only. Maximum usable frequencies (MUFs) on UT day 02-Sep were 
initially near predicted values to 15% enhanced, becoming depressed 
by 15-20% after local dawn this morning for the southern Australian 
region. Northern Australian region MUFs were 15% enhanced after 
local dawn this morning. Strong spread F was observed at Hobart 
during local night hours. MUFs at Hobart during local night hours 
were depressed by 15-30%. A minor fadeout only impacting the 
ionospheric E region was observed at Learmonth in association 
with the M3 flare. For 03-Sep MUFs for the southern Australian 
region are expected to be 15-20% depressed, whilst northern Australian 
region MUFs are expected to remain near predicted monthly values 
to 15% enhanced. Further depressed frequencies of ionospheric 
support expected 04-Sep.

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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