[Ips-dhfpr] ASWFC Daily HF Prop Report - 03 September 23 issued 2330 UT on 03 Sep 2023 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/03 SEPTEMBER 2023
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (03 SEPTEMBER) 
Date   T index  Conditions    
03 Sep    76    Fair           

Flares    Max     Fadeout    Freq.  Sectors
  M1.1    0023UT  possible   lower  West Pacific
  M6.0    0836UT  probable   lower  Mid East/Indian

MUFs:
   Cocos Island Region:
      Near predicted monthly values during local day.
      Depressed by 20% during local night.
   Niue Island Region:
      Enhanced by 20-30%.
   Northern Australian Region:
      Near predicted monthly values to 15% enhanced.
   Southern Australian Region:
      Depressed by 20-25% local day.
      Near predicted monthly values to 15-20% depressed,
      local night.
   Antarctic Region (Casey/Davis/Mawson):
      Depressed by 35% over the UT day.

PCA Event : No event.

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


2. FORECAST (04 SEPTEMBER - 06 SEPTEMBER)
Date   T index  Conditions       MUFs                              
04 Sep    90    Normal-fair      Near predicted monthly values
05 Sep    90    Normal           Near predicted monthly values    
06 Sep    90    Normal           Near predicted monthly values   

COMMENT: ASWFC Preliminary HF Communications Warning 84 was issued 
on 31 August and is current for 3-4 Sep. Maximum usable frequencies 
(MUFs) on UT day 03-Sep were depressed by 15-25% for the southern 
Australian region. Northern Australian region MUFs were generally 
near predicted monthly values to 15% enhanced. Strong spread 
F was observed at Hobart during local night hours. A very minor 
brief fadeout only impacting the ionospheric E region was observed 
at Darwin in association with the M1 flare. For 04-06 Sep MUFs 
now expected to be near predicted monthly values, with degraded 
HF conditions likely during local night hours 04-05 Sep for the 
southern Australian region.

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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