[Ips-dhfpr] ASWFC Daily HF Prop Report - 22 September 23 issued 2330 UT on 22 Sep 2023 [SEC=OFFICIAL]

[Regional Warning Centre]

SUBJ: ASWFC DAILY HF PROPAGATION REPORT
ISSUED AT 2330UT/22 SEPTEMBER 2023
FROM THE AUSTRALIAN SPACE WEATHER FORECAST CENTRE
AUSTRALIAN REGION SUMMARY AND FORECAST

1. SUMMARY (22 SEPTEMBER) 
Date   T index  Conditions    
22 Sep   109    Normal         

Flares    Max     Fadeout    Freq.  Sectors
  M1.2    0337UT  possible   lower  E. Asia/Aust.
  M1.4    1624UT  possible   lower  South American/
                                    Atlantic
  M1.9    2300UT  possible   lower  West Pacific

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

PCA Event : No event.

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


2. FORECAST (23 SEPTEMBER - 25 SEPTEMBER)
Date   T index  Conditions       MUFs                              
23 Sep   110    Normal           Near predicted monthly values
24 Sep   105    Normal-fair      Near predicted monthly values 
                                 to 10-15% depressed    
25 Sep    95    Normal-fair      Near predicted monthly values 
                                 to 10-15% depressed   

COMMENT: Maximum usable frequencies (MUFs) in the Australian 
region on UT day 22-Sep were near predicted values. Brief spread-F 
was observed in Hobart and Perth during local dawn hours, but 
otherwise ionospheric conditions were good. A minor HF fadeout 
was observed over the Australian region from 22/0306-0415 UT. 
MUFs are expected to be near predicted values over 23-25 Sep, 
with possible depressions of 10-15% during local night hours 
due to possible geomagnetic activity over this period. Shortwave 
fadeouts are probable.

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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